FR2507970A1 - PNEUMATIC VEHICLE - Google Patents

Abstract

VEHICLE TIRES WITH RADIAL CARCASSES AND REINFORCEMENT OF THE ROLLING SURFACE, IN WHICH THE RADIALLY INNER LAYER OF THE CARCASS CONSTITUTES THE RESISTANT SUPPORT, WHILE THE RADIALLY OUTER LAYER OF THE CARCASS IS REALIZED IN THE FORM OF A LESS LAYER A LOWER YARN COMPACTNESS. THE CARCASS IS OF LOW WEIGHT. THE AUXILIARY LAYER IMPROVES THE NEUTRAL FIBER POSITION OF THE BENDING LOAD AND THE BENDING ZONE OF THE TIRE, WHICH ALSO PROVIDES LOWER ROLLING RESISTANCE AND GOOD OVERALL HANDLING. APPLICATION TO THE EQUIPMENT OF PASSENGER CARS AND TRUCKS.

Description

I

  The present invention relates to a pneumatic

  of a vehicle with a radial carcass, two

  lons, a running surface and a reinforcement of

  a belt-shaped bearing surface, said carcass being constituted by two layers of rope fabric, of which that which is radially inner surrounds

  the heel rod and the axial support strip-

  from the inside to the outside and forms one end

  said casing being internally lined with a layer of protective rubber and externally with a lateral wall strip, said radially outer casing extending axially outwardly from said elements; Such tires with radial carcass or with belt are standard for the equipment of both passenger cars and heavy weight vehicles. The carcass is formed in these tires by two layers of fabric.

  of identical rope, the orientation of the warp threads

  is inclined by about 90 + a tolerance, by

  relative to the median plane of the periphery of the tire.

  These cord fabric layers are fcrmées proven cord materials such as rayon, nylon (trade name) or a polyester, and provide resistance, which varies depending on the material, construction rope son and density trim rope son, and ensures in all cases eu safe abrsorption the carcass varying stresses which occur in the rope son of the carcass as a result of the pressure and eonflage ie the load a

  such carcass * also has a reserve

  which, to the point of being a constraint,

  bursting, is void of that is

  necessary. Known carcasses, which are formed of two layers of rope fabric identical and equivalent to

  maximum packing density and scrub,

  a considerable part of the weight of the tire.

  that no changes have been made to

this weight of the carcass.

  Current requirements for tires,

  with regard to safety, road holding, eco-friendliness and

  comfort and comfort, are always accompanied by a

  essential principle, namely to carry out a construction

  as light as possible, but not at the expense of

of security.

  Lightweight tires significantly reduce

  rolling resistance, and rolling resistance

  This is particularly important in these times of scarcity.

of raw materials.

  A carcass with a single layer can, if necessary, significantly reduce weight.

  a belt tire equipped with such a carcass

  The serious disadvantage of poor roadholding is the flexing area of the tire, that is, the part of the tire that lies between the shoulder of the tire.

  running surface and heel, would be disadvantageous-

  large and would have a negative influence on the

  lateral stability and stabilization after a change in

  management, as well as cornering behavior,

in radial-ply tires.

  In view of the foregoing, the object of the invention is to create a vehicle tire as described at the beginning of this preamble, having a carcass of reduced weight to an appropriate extent, adapted to the strength requirements and giving to the tire, handling, properties comparable to those of a standard tire comprising

  a usual two-ply carcass.

  For this purpose, according to the invention, in a

  vehicle as defined above, the

  radially inner layer of the carcass

  is made of a compact rope fabric made of

  male, constitutes the resistant support of the carcass, and the radially outer layer of this carcass is

  in the form of an auxiliary layer, a

  tensile strength less than 20 ° O less than that of the inner layer, and lower wire compactness than the latter, the strength of a layer being determined by the product of the packing density and the the resistance of the rope threads as well

than their scrub.

  In the configuration according to the invention,

  the inner layer of the carcass is essential

  its strong support, and the outer layer of the carcass has the function of ensuring a good handling and a reduction of weight The bending zone of the tire is more advantageous than in a standard tire as described La neutral fiber of

  the bending load of the side wall is advan-

  in the vicinity of the inner layer of the carcass. This result can be achieved with a layer

  auxiliary having a relative packing density

  low and / or with a relatively

little of the rope.

  The radially outer layer of the car-

  In this case, preferably, a rope string packing density 20 to 70% lower than that of the normal cord compactness rope inner layer is provided. This inner layer preferably has a packing density. range

between 55 X / and 95 "".

  According to other characteristics of the invention, the relatively compact auxiliary layer with relatively small wires constituting the radially outer layer

  the carcass may differ in respect of the

  truction of the rope threads and the fabric material, the inner layer of the carcass forming the strong support thereof The auxiliary layer may further be formed of single thread (s) instead of rope A son In this connection, a whole series of simple industrial threads can be provided. For example, in the auxiliary layer a single wire of polyamide or aromatic polyamide can be provided because of the favorable specific gravity and the tensile strength and other physical properties which , in the case of a

  aramid, are comparable to those of metal son.

  In all cases of use, including

  composite construction of the carcasses, we obtain a

  more or less weight of the carcass and, consequently, also of the tire, which thus

  lower rolling resistance.

  In addition, the thickness of the scrub of the auxiliary layer can also be reduced Preferably, the thickness can be reduced to 50 in addition to the diameter of the rope or wires. For example, the total layer thickness D can to be equal to

  (diameter of the rope) + 2 x 0,05 mm

  In addition, in the case of scrubbing, a hemicare may have a higher modulus than the radiolayer layer.

  inside the carcass The module of the layer

  can be considerably greater than the

  their normals, which are of the order of 10.0 M Pa for a 3005 module, and can be between 15.0 and

, 0 M Pa.

  In this way, it is possible to obtain

  relatively light carcass, whose rope threads, substantially parallel to each other, extend

  a relatively large lateral distance from each other

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  in the vicinity of the support strip 5.

  The radially inner layer 12 of the carcass consists of gummed cord yarns of normal compactness, that is to say, relatively tight The packing density, that is to say the number of cord threads per decimeter, measured in the region above the bead wire, reached for example in the case of a string of rayon type of

  fila 1840/2 about 100 to 130 threads of rope (epdm -

  number of ends per decimeter) Instead of rayon, carcass cord materials, nylon or polyester threads, are often chosen.

  It is also possible to use the material of the car-

  breaks aromatic polyamide ropes or cores

  Thin flexible metal The packing density

  of the carcass layer, 12

  sure, for radial tires, the resistance

  necessary for the absorption of variable constraints

  driven by the inflation pressure and the load, as well as the desirable flexibility to ensure a good hold

  of road and the necessary comfort This density of

  Moreover, it also prevents the butyl rubber

  the 10 can penetrate the carcass.

  The radially outer layer 14 of the carcass surrounds the inner layer 12 over the entire length of its periphery and extends in the region of the bead axially outside the support strip and the carcass casing 13. carcass 14 is made with low compactness in son It can for this purpose have a low packing density and / or

  a small number of single threads per lead rope

  the packing density is 70% less than that of the inner layer g at least,

  packing densities of 20% are still acceptable.

  As rope materials, one can choose from

  yonne, nylon, polyester or aromatic polyamides

ticks.

  A radially outer layer 14 of car-

  breakage, which contains only 25 to 60 threads per decimeter, depending on the material of the single threads and the type of rope, significantly reduces the weight of the carcass. The auxiliary layer with compactness in relatively weak wires fulfills the important function of ensuring a good road holding It extends (as

  shown in Figure 2) as a wide-meshed net

  because of the weft threads present on the layer of

  carcass 12 The carcass layer 14 creates, consequently,

  quence, a flexion zone 15 of advantageous configuration

  geous. this area is narrower than in the case of a single layer carcass, but wider than in the case of a two-ply carcass consisting of two identical layers of rope fabric with a high packing density. at the disposal of the carcass layer 14 made in the form of an auxiliary layer, the neutral fiber 16 of the charges

  bending of the side wall is advantageously

  in the vicinity of the radially inner layer 14 of the carcass These two measures improve the general road holding of the belt tire The saving of weight in the carcass gives the tire resistance to the tire.

favorable turnover.

  Various requirements are imposed on

  safety, handling, economy and comfort Behavior such as driving and steering, among other things, is part of the general road holding This behavior includes steering stability, steering precision , stabilization after changes of direction, the

  possibility of controlling driving in

  mites and behavior from the shell point of view

  reminder This handling is good thanks to the confi

  guration and at the disposal of the atilaiai layer. Safety includes in particular the ability to maintain the inflation pressure against burst pressure With regard to the uminmie,

  In addition to acceptable costs, it is also possible to

  among other things, low rolling resistance,

  which results in low energy costs.

  As for comfort, it includes the power of amnr-

  the uniformity of the tire and the

  Silent Good values of cushioning power

  are obtained thanks to the auxiliary layer.

BOARD

  Carcass made of two layers with a minimum packing density Inner layer of the carcass: Mei Ie _p d Rope D 1 ns-ii of packing Number of Diameter of the

minimum (%: sonl dm son of

  _ _ _ _ _ _ _ _____ _____________ (endm) of (m) Thickness of the scrub (mm) Radius 1220 / zl

1840/2

1840/3

Nylon 940/2

I 400/2

Polyester 1100/2

1100-1135

  Ararnide 1670/2 Outer layer of Rayon 1220/1840 /

18> 34 /

1 E 640 /

  I 2 "20 / i Nylon 940/940/1400 / Polyester I 00/2,

1100/3

Aramid 1670/2

1670/1

  Density 4 of packing ()%%% carcass% = diameter by dm

(auxiliary layer)

  re rope op, 6 0.72 0.85 0.53 0.65 0.55 0.65 0.70 a Diameter of rope thread

+ 2 x 092 (MM).

  0, 6 0, 72 Diameter 0.40 strands 0.35 + 2 x 0.05 (mm) 0.53 0.43 0.65 0.55 0.65 0.35 (mm) '46 number They are examples of carcass configurations in which

  the radially outer layer is an auxiliary layer

iary.

Example 1

  The radially inner layer 12 is formed

  1840 / triple type of rope type of rope

  yarns present per decimetre: 76 This corresponds to

  at 65% packing density The tractive force

  is 25 kgp (value per wire).

  The outer layer 14 in the form of an auxiliary layer is made of cord type rayon 1220 / double Number of wire ends present per decimeter: 116 This corresponds to a packing density of 70% The tensile strength is

of 10.2 kgp (Value per thread).

  Due to the type of rope chosen, the layer

  auxiliary is compact in relatively weak son.

  The tensile strength and, therefore, also the strength of the fabric are about 37% lower

  than those of the radially inner layer.

Example 2

  The radially inner layer 12 is rayon of the rope type 1840 / double Number of wire ends present per decimetre: 130 This corresponds to

  a packing density of 93.6%.

  The diameter of the wires is 0.72 mm The thickness

  of the layer is 1.38 mm; therefore, the thick

  The peel is 0.33 mm in addition to the diameter of the wires.

  The pulling force is 18.5 kgp.

  The strength of the fabric is 2405 kgp / dm. The 300% modulus of the scrubbing mixture reaches 9.1 M Pa.

  the weight of the fabric was 1503 g / m 2 The outer layer

  re 14 performed as an auxiliary layer is in

Rope type nylon 1400 / single.

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Claims (7)

  1 A vehicle tire having a radial carcass, two beads, a tread surface and a belt-shaped tread surface reinforcement, said carcass consisting of two layers of rope fabric, one of which is radially inner surrounds the heel rod and the support strip, axially from the inside to the outside, and forms an envelope end, and of which the radially outer one extends into   the heel axially outside these elements, and the-   said carcass being internally covered with a   protective rubber and externally   sidewall strip, said tire being characterized   in that the radially inner layer (12)   of the carcass, a layer which is formed of a tissue of   from compact to normal son, constitutes the support   carcass strength, and in that the layer   outer diameter (14) of the carcass is in the form of an auxiliary layer, a resistance to   the traction is at least 20% lower than that of the   inside the carcass and a lower   quoted in son that this one, the resistance of a layer   being determined by the product of the density of gar-   niture and resistance of the rope threads as well as of their exfoliation.   2 Pneumatic vehicle according to the   claim 1, characterized in that the radial layer   outer casing (14) has a lower packing density of rope than   the radially inner layer of the carcass.   3 Pneumatic vehicle according to the claim   1, characterized in that the radially outer layer   (14) the carcass has a smaller number   of single threads of rope that the radia- inside the carcass.   4 Pneumatic vehicle according to the claim   tion 1, characterized by the simultaneous use of   positions mentioned in claims 2 and 3.   Vehicle tire according to one of   preceding claims, characterized in that   used for the radially inner layers and   outer dial (12, 14) of the carcass, tissue   of different rope from the point of view of material and truction of the wires.   6 Pneumatic vehicle according to one of   preceding claims, characterized in that the   radially outer layer (14) of the carcass is   formed of single wire (s) to the rope fabric leu.   7 Pneumatic vehicle according to one of   preceding claims, characterized in that the   radially outer layer (14) of the carcass   feels a reduced peel thickness of up to 50% in   plus the diameter of the rope or wires.   8 Pneumatic vehicle according to one of   preceding claims, characterized in that   used for the radially inner layers and   exterior of the carcass of the different scrubs   ferns in the module point of view, the outer layer   (14) being the one presenting the scrub having the dule the highest.