[go: up one dir, main page]

WO2025134147A1 - Pneu non pneumatique - Google Patents

Pneu non pneumatique Download PDF

Info

Publication number
WO2025134147A1
WO2025134147A1 PCT/IN2024/052400 IN2024052400W WO2025134147A1 WO 2025134147 A1 WO2025134147 A1 WO 2025134147A1 IN 2024052400 W IN2024052400 W IN 2024052400W WO 2025134147 A1 WO2025134147 A1 WO 2025134147A1
Authority
WO
WIPO (PCT)
Prior art keywords
spokes
tire
array
pneumatic tire
tangential
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/IN2024/052400
Other languages
English (en)
Inventor
Renji Issac
Prashant Dholiya
Anurag YADAV
Ankit Dixit
Ankit Parikh
Chirag Patel
Nidil CP
Saurabh Rajpurohit
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CEAT Ltd
Original Assignee
CEAT Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CEAT Ltd filed Critical CEAT Ltd
Publication of WO2025134147A1 publication Critical patent/WO2025134147A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • B60C1/0016—Compositions of the tread
    • 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
    • B60C7/00—Non-inflatable or solid tyres
    • B60C7/10—Non-inflatable or solid tyres characterised by means for increasing resiliency
    • B60C7/14—Non-inflatable or solid tyres characterised by means for increasing resiliency using springs
    • B60C7/146—Non-inflatable or solid tyres characterised by means for increasing resiliency using springs extending substantially radially, e.g. like spokes
    • 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
    • B60C7/00—Non-inflatable or solid tyres
    • B60C7/10—Non-inflatable or solid tyres characterised by means for increasing resiliency
    • B60C7/14—Non-inflatable or solid tyres characterised by means for increasing resiliency using springs
    • B60C7/16—Non-inflatable or solid tyres characterised by means for increasing resiliency using springs of helical or flat coil form
    • B60C7/18—Non-inflatable or solid tyres characterised by means for increasing resiliency using springs of helical or flat coil form disposed radially relative to wheel axis
    • 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
    • B60C7/00—Non-inflatable or solid tyres
    • B60C7/22—Non-inflatable or solid tyres having inlays other than for increasing resiliency, e.g. for armouring

Definitions

  • the present subject matter relates, in general, to vehicle tires and, particularly, but not exclusively, to non-pneumatic vehicle tires.
  • Tires support the load of a vehicle and impact handling, drivability, and safety of the vehicle.
  • a tire is mounted on a wheel’s rim to transfer a load of the vehicle from the axle through the wheel to the ground and to provide traction on the surface over which the wheel travels.
  • tires such as those for automobiles and bicycles, are pneumatically inflated structures filled with air, which provide a flexible cushion that absorbs shock when the tire rolls over uneven surfaces.
  • Tires provide a footprint, called a contact patch, that is designed to match the weight of the vehicle with the bearing strength of the surface that it rolls over by providing a bearing pressure that will not deform the surface excessively.
  • the pneumatic tires are susceptible to puncture when the tire encounters an object, such as a pothole or some shaped edge stone or metal pieces. Thus, to avoid such issues, non-pneumatic tires are preferred over pneumatic tires nowadays.
  • FIG. 1 illustrates a cross-sectional view of a tangential nonpneumatic tire showing a spoke, in accordance with an implementation of the present subject matter
  • Fig. 2 illustrates a cross-sectional view of an array of spokes of the tangential non-pneumatic tire showing two sets of spokes having offset, in accordance with an implementation of the present subject matter
  • Fig. 3 illustrates a perspective view of the array of spokes containing two sets of spokes depicting the offset , in accordance with an implementation of the present subject matter
  • Fig. 4 illustrates a cross-sectional view of the tangential nonpneumatic tire, in accordance with an implementation of the present subject matter.
  • a pneumatic tire used in most vehicles or other industrial applications comprises a tread, bead, sidewall, shoulder, and ply.
  • the tread is the part of the tire that comes in contact with the road surface.
  • the tire bead is the part of the tire that contacts the rim of the wheel.
  • the characteristic feature of the pneumatic tire is the use of air-filled chamber between the rim and the tread that support the tread of the tire.
  • pneumatic tires suffer some disadvantages.
  • pneumatic tires are susceptible to punctures which results in flats and requires immediate repair or replacement.
  • maintenance requirements like regular inflation is a must for pneumatic tires.
  • extreme temperatures can also affect the air pressure in pneumatic tires, potentially leading to overinflation or underinflation.
  • pneumatic tires are also vulnerable to blowouts.
  • the production and disposal of pneumatic tires owing to their relatively shorter life as compared to non-pneumatic tires, can have environmental consequences as old tires may lead to waste management challenges.
  • TN PT tangential nonpneumatic tire
  • the tangential non-pneumatic tire comprises an inner band, an outer band, and an array of spokes extending in a circumferential and radial direction of the tire between the inner band and the outer band.
  • the inner band interfaces with a rim of a wheel on which the tire is to be mounted.
  • the outer band is separated from the inner band and forms a tread portion of the tire.
  • Each spoke in the array of spokes comprises multiple circular rings placed adjacent to each other and connected about their circumference so that centres of the multiple circular rings form a notional circle. Further, at least two of the spokes in the array of spoke is placed laterally and offset to each other along the width of the tire.
  • the array of spokes is positioned along the width of the tire in the region between the rim and tread of the tire, throughout the circumference of the tire.
  • the width of the array of spokes may correspond to the width of the tread of the tire.
  • the array of spokes is formed by placing multiple spokes one behind the other, along the width of the tire. Each spoke is placed laterally and offset to each other. Further, examples where two or more of the spokes (and not all the spokes in the array) are placed laterally and offset to each other are also possible.
  • the array of spokes supports the load of the vehicle during the rotation of the wheel ensuring adequate traction forces and directional control.
  • the material used for making the array of spokes and the arrangement or structural configuration of the array of spokes inside the tire provides a supporting structure for bearing the load of the vehicle, thereby allowing the load-bearing properties of the present nonpneumatic tires to be similar or even better than those provided by the conventional pneumatic tires.
  • the tangential non-pneumatic tire in accordance with the present subject matter provides many advantages over the conventional pneumatic tires.
  • the tangential non-pneumatic tire is durable, resistant to wear and tear, and resistant to puncture as it lacks an air-filled chamber.
  • the tangential non-pneumatic tire requires low maintenance as there is no risk of leaks and it has relatively low sensitivity to temperature.
  • the tangential non-pneumatic tire is more reliable as it can maintain its performance even if it is damaged.
  • the tangential non-pneumatic tire is made from eco-friendly materials leading to a reduced environmental footprint.
  • Fig. 1 illustrates a cross-sectional view of a tangential nonpneumatic tire 100 showing a spoke (hereinafter referred to as spoke 102), in accordance with an example implementation of the present subject matter.
  • spoke 102 is a part of the array of spokes (shown later).
  • the array of spokes is positioned between an inner band 106 that interfaces with a rim (not shown in Fig 1 ) of a wheel on which the tire is to be mounted and an outer band 108 that forms a tread portion of the tire.
  • the outer band 108 comprises one or more layers subsequently described in Fig. 4.
  • the inner band 106 and the outer band 108 of the tangential non-pneumatic tire 100 may have a layered structure comprising one or more layers of same or different materials.
  • the spoke 102 is formed by placing multiple circular rings or ring-like elements adjacent to each and connecting them about their circumference so that centres of the multiple circular rings form a notional circle. While not apparent from the view depicted in Fig. 1 , the circular rings or ring-like elements have a width as well as a certain thickness.
  • ten circular rings may form the spoke 102. In another example, more or less than ten circular rings are required to form the spoke 102. As will be understood, the dimensions of the width and thickness of the circular rings as well as the selection of number of rings to form the spoke 102 may depend on various factors like size of the tire, the load that the tire 100 is designed to bear etc.
  • each individual circular ring also referred to as circular element or simply element, is made up of multiple strands of metal wire with a rubber coating stacked one above the other to form a spiral.
  • the metal wire is overlaid 10 times to form the circular element.
  • the circular element may be flexible, and lateral force build-up may be achieved by a torsional deformation of the circular elements when a torsional force (steering input) is applied. A counterforce generated due to the torsional deflection provides the selfalignment torque needed for a tire.
  • the multiple strands of metal wire are first coated with rubber and then wound in a spiral fashion with one layer above or adjacent the other to form a circular ring-like structure.
  • the outer surface of the circular ring is made of rubber by coating it with rubber.
  • metal wire may be stainless steel.
  • the stainless steel possesses adequate load-bearing capacity as well as an appropriate modulus of elasticity.
  • the configuration of the metal wire and the amount of rubber coating required to form the circular ring is based on the size, structural strength, and load-bearing capacity of the tangential nonpneumatic tire 100.
  • each array of the spoke 102 is first created with circular rings and then placed between the inner band 106 and the outer band 108 of the tangential non-pneumatic tire 100.
  • there is a single wire coated with rubber which is overlaid to form a ring and the same wire then extends to a second adjacent ring and this goes on, thereby keeping all rings in the spoke 102 intact.
  • all rings in one array of the spoke 102 are made of single long rubber-coated wire without any break.
  • a rubber layer, referred to as inner band above (elaborated below in reference to Fig.
  • the spoke 102 may be placed between the inner band 106 and the outer band 108 of the tangential nonpneumatic tire 100 by curing the spoke 102 that may be carried out at suitable temperature.
  • the spoke 102 may be precisely placed between the inner band 106 and the outer band 108 of the tangential non-pneumatic tire 100 and then cured at a temperature in range of 100°C to 150°C.
  • the curing may be carried out at a pressure in range of 4 bar to 10 bar. The combination of heat and pressure activates chemical crosslinking in the rubber layer present between the inner band 106 and the outer band 108 which in turn fix the spoke 102 between the inner band 106 and the outer band 108 of the tangential non-pneumatic tire 100.
  • FIG. 2 illustrates a cross-sectional view of the array of spokes of the tangential non-pneumatic tire showing two sets of spokes having an offset, in accordance with an implementation of the present subject matter.
  • Fig. 3 illustrates a perspective view of the array of spokes containing two sets of spokes depicting the offset, in accordance with an implementation of the present subject matter. Since Figures 2-3 illustrate an arrangement relationship of a plurality of elements constituting the spoke 102, for the sake of ease of explanation, Figures 2-3 are explained together.
  • an array of spokes 102 is created by placing one spoke behind the other spoke along the width of the non-pneumatic tire 100.
  • a rubber-coated wire flows across all the circular elements in the spoke 102, thereby keeping the circular elements intact.
  • rubber curing of all areas around the spoke 102 between the outer band 108 and the rim 104 helps to keep the circular element as well as the spoke 102 itself, intact.
  • the array of spokes 102 comprises a first spoke 102a and a second spoke 102b along the width of the non-pneumatic tire 100.
  • the depicted embodiment with two spokes is not a limitation and various other example implementations with the array of spokes 102 comprising one or multiple layers of spokes along the width of the non-pneumatic tire 100 are possible.
  • each spoke in the array of spokes 102 is placed laterally and offset to each other.
  • each spoke is not completely aligned with the other spoke along the width of the non-pneumatic tire, rather the spokes 102 are laterally placed offset to each other.
  • the offset between the at least two spokes in the array of spokes may be 45°.
  • the first spoke 102a is placed laterally and offset by 45° with respect to the second spoke 102b.
  • the offset between the at least two spokes in the array of spokes 102 may be 10°.
  • the offset between the at least two spokes in the array of spokes 102 may be 80°.
  • the first spoke 102a and the second spoke 102b may be offset with respect to each other, while the second spoke 102b and the third spoke (not depicted in Fig. 3) may not be offset with respect to each other.
  • the third spoke may align with the first spoke 102a and may be positioned behind the first spoke 102a without the offset with the second spoke 102b having an offset sandwiched in between the first 102a and the third spoke.
  • each ring of the spoke 102 has a certain width as mentioned above.
  • the width may be selected in proportion to the width of the tread of the tire 100 or the width of the rim 104.
  • the number of spokes required in the array of spokes 102 for the tire having a 120 mm tread width is ten.
  • Fig. 4 illustrates a cross-sectional view of a tangential nonpneumatic tire. In accordance with an example implementation of the present subject matter.
  • the array of spokes 102 extend in a circumferential and radial direction of the tire 100 between an inner band 106 and the outer band 108.
  • the inner band 106 interfaces with the rim 104.
  • the outer band 108 comprises a tread layer 110, a under-tread layer 112, and a belt layer 116.
  • the tread layer 110 contacts with a surface during the rotation of the tire 100.
  • the under-tread layer 112 is positioned between the tread layer 110 and the belt layer 116.
  • the belt layer 116 interfaces with the array of spokes 102.
  • the belt layer 116 is made of nylon, polyester, steel, fiberglass, aramid, for example, to keep the array of spokes 102 together and to govern the radial growth of the TNPT structure. This also ensures the tangential stiffness needed for the TNPT to operate in the direction of rotation is achieved without much energy loss and also helps in handling the acceleration and braking torques effectively.
  • the tread layer 110, the under-tread layer 112, and the inner band 106 may be made up of at least one of natural rubber, styrene butadiene rubber (SBR), thermoplastic elastomer (TPE), thermoplastic polyurethane (TPU), fiber glass, a combination thereof, or any suitable material.
  • SBR styrene butadiene rubber
  • TPE thermoplastic elastomer
  • TPU thermoplastic polyurethane
  • fiber glass a combination thereof, or any suitable material.
  • a rubber layer is formed everywhere around the circular elements between the inner band 106 and the belt layer 1 16. This rubber is cured to keep the circular element, as well as the spoke 102 intact.
  • the tangential non-pneumatic tire 100 having a tread width 120 mm may comprise ten spokes to form the array of spokes 102.
  • the metal wire may be overlaid 10 times to form the circular element.
  • the diameter of the wire may be 1 .30 mm.
  • the tangential non-pneumatic tire 100 is designed for light vehicles, such as passenger cars, two-wheelers, three-wheelers, etc.
  • the tire has an outer diameter ranging from 300 mm to 1500 mm and a tread width ranging from 60 mm to 280 mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Abstract

La présente divulgation concerne un pneu non pneumatique tangentiel (100). Le pneu (100) comprend une bande interne (106), une bande externe (108) et un réseau de rayons (102). Le réseau de rayons (102) s'étend dans une direction circonférentielle et radiale du pneu (100) entre la bande interne (106) et la bande externe (108). Chaque rayon dans le réseau de rayons (102) comprend de multiples anneaux circulaires qui sont placés adjacents les uns aux autres et qui sont reliés autour de leur circonférence comme des centres des multiples anneaux circulaires pour un cercle fictif. En outre, au moins deux des rayons dans le réseau de rayons (102) sont placés latéralement et décalés l'un par rapport à l'autre le long de la largeur du pneu (100).
PCT/IN2024/052400 2023-12-22 2024-12-19 Pneu non pneumatique Pending WO2025134147A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN202321088342 2023-12-22
IN202321088342 2023-12-22

Publications (1)

Publication Number Publication Date
WO2025134147A1 true WO2025134147A1 (fr) 2025-06-26

Family

ID=96136581

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IN2024/052400 Pending WO2025134147A1 (fr) 2023-12-22 2024-12-19 Pneu non pneumatique

Country Status (1)

Country Link
WO (1) WO2025134147A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20230023087A (ko) * 2021-08-09 2023-02-17 한국타이어앤테크놀로지 주식회사 비공기입 타이어
JP2023150619A (ja) * 2022-03-31 2023-10-16 横浜ゴム株式会社 非空気式タイヤ

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20230023087A (ko) * 2021-08-09 2023-02-17 한국타이어앤테크놀로지 주식회사 비공기입 타이어
JP2023150619A (ja) * 2022-03-31 2023-10-16 横浜ゴム株式会社 非空気式タイヤ

Similar Documents

Publication Publication Date Title
EP2686174B1 (fr) Pneu non pneumatique avec renforcement annulaire des rayons
EP3519204B1 (fr) Rayon en gomme renforce pour roue
US9616713B2 (en) Non-pneumatic tire
EP2386430B1 (fr) Pneu comportant des ressorts et procédé de fabrication d'un pneu
CN108068549B (zh) 非充气支撑结构
EP3681735B1 (fr) Pneu non pneumatique
US9016336B2 (en) System for non-pneumatic support of a vehicle
EP2664463B1 (fr) Système de support non pneumatique d'un véhicule
JP5314621B2 (ja) 非空気圧タイヤ
US20090211677A1 (en) Modular tire assembly
EP3863866B1 (fr) Bandage non pneumatique ayant de multiples cercles de cisaillement
US20190299717A1 (en) Wheel and tire assembly
US11027578B2 (en) Wheel and tire assembly
US12459297B2 (en) Non-pneumatic tire having reinforced support structure and method of making same
WO2025134147A1 (fr) Pneu non pneumatique
US11697307B2 (en) Wheel for a support structure
US12179526B2 (en) Non-pneumatic tire and method of manufacture thereof
US11975574B2 (en) Tire/wheel assembly for a support structure
US20240227448A1 (en) Non-pneumatic tire with multi angle tension control reinforcements
US11794513B2 (en) Wheel for a support structure
US20250353328A1 (en) Self-supporting spoke structure for non-pneumatic tire
EP4084966B1 (fr) Bandage non pneumatique ayant un revêtement de paroi latérale moulé
EP4642654A1 (fr) Roue sans air
CN120882571A (zh) 具有优化的支撑结构的无气轮胎

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 24906772

Country of ref document: EP

Kind code of ref document: A1