Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
  • B60B11/00—Units comprising multiple wheels arranged side by side; Wheels having more than one rim or capable of carrying more than one tyre
  • B60B11/04—Wheels with a rim capable of carrying more than one tyre

Definitions

• the present invention relates to road motor vehicles, more particularly but not exclusively, fast automobiles, such as limousine coupes for large tourism and sports and racing cars More generally, the invention relates to road motor vehicles capable of reaching a speed of at least 120 km / h, level.
• the invention relates, more specifically, to the manner in which the pneumatic tires of these vehicles are arranged.
• the characteristics of the pneumatic tires of the wheels of road motor vehicles play an essential role with regard to the handling of the vehicle and the grip of the wheels.
• width of the profile of normal type tires is of the order of 0.8.
• width of the profile of normal type tires is of the order of 0.8.
• Pneumatic tires with a large cross-section also have the disadvantage of a high cost, as well as that of causing a significant reduction in ride comfort, compared with "normal" tires, the latter being the result of a poor shock absorption produced by irregularities in the road surface, due, in particular, to the fact that the sidewalls of wide-section tires are less high and less deformable than those of normal tires.
• pneuma ⁇ tick off section, as well as the normal tires tend, at high speeds reached by the fast cars, to warm up to high tempé ⁇ r erasures which may cause sudden destruction of the tire and in any case shortens its life.
• the object of the invention is to improve the handling of automobiles, in particular fast automobiles, in particular in tight turns taken at high speed, as well as the grip of tires on wet roads or
• the invention also aims to reduce the cost price of the tire equipment of a fast automobile.
• the invention aims to improve the driving comfort of fast and sporting cars and to reduce the intensity of heat from tires of cars, in particular sports cars and passenger cars. stroke, in case of prolonged rolling at high speed.
• the invention aims to limit the risk of accident in the event of a puncture or burst of pneuma ⁇ tick, while avoiding the need to perform a wheel change on the spot in the event of a flat tire.
• the invention provides a motor vehicle of the type comprising at least two front wheels and two rear wheels for supporting the vehicle body by means of suspension members, front wheels being orientable so as to allow the direction of the vehicle to be modified, this vehicle being characterized in that at least the two front wheels are each provided with a plurality of pneumatic tires.
• all the wheels are each provided with a plurality of pneumatic tires.
• Figure 1 is a schematic perspective view of a first embodiment of the vehicle according to the invention.
• Figure 2 is a schematic perspective view of a part of the vehicle corresponding to the form of execution shown in Figure 1;
• Figure 3 is a partial view, in section, of a vehicle wheel, according to a second embodiment
• Figure 4 is a partial view, in section, of a vehicle wheel, in accordance with a third form of execution.
• Figure 5 is a partial view of a wheel, similar to that shown in Figure 4, provided with a kind of pneumatic tire particularly suitable for use in the context of the invention.
• the automobile represented in FIG. 1 comprises a bodywork 8, supported by two front wheels 9 and by two rear wheels 10.
• the front wheels 9 and the rear wheels 10 are each provided with two pneumatic tires 11.
• FIG. 2 represents a part of the automobile comprising one of the front wheels 9, fitted with two tires 11.
• the axle of the wheel 9 is connected, in the usual manner, by a suspension triangle comprising two rigid bars 12 and 13 hinged together and a flexible bar 14, to an upright 17 forming part of the chassis of the automobile.
• two articulated bars 15 and 16 connect the axis of the wheel 9 to the steering mechanism of the automobile (not shown) and make it possible to orient the wheel 9 to steer the automobile.
• the wheel 9 supports the bodywork via a telescopic damper 20 and a helical spring 21.
• the motor 18 is supported by the uprights 17 to which it is connected by fastening elements 19.
• the wheel 9, shown in Figure 2 is, for example, arranged as shown in Figure 4 and described below.
• the rim 1 of the wheel 6 forms a single piece, for example a molded piece of metal alloy , such as an alloy based on aluminum or magnesium, with the web 5 of the wheel 6 and has three profiles 2a, 2b and 2c on each of which is mounted a respective tire 3a, 3b and 3c.
• the parts not shown of the wheel 6 are similar to the corresponding parts of the wheels of the usual type.
• the neighboring tires, 3a and 3b, on the one hand, and 3b and 3c, on the other hand, are separated by spaces 4 and 4 r .
• the improvement in grip on wet roads can be attributed to. the layer of water is easily "cut" by each tire, thanks to the narrowness
• the rim of the wheel 6 ' has two profiles 2' a and 2'b, rigidly assembled on a support piece 7, integral with the web 5 'of the wheel 6'.
• the part 7 and the veil 5 ′ may be, for example, constituted by a single part coming from a light alloy molding.
• Each of the two profiles 2 'a and 2 r b allows the mounting of a respective pneuma ⁇ tick 3' a and 3 r b.
• the fixing of the profiles 2 ′ a and 2 ⁇ b on the support piece 7 can be carried out in any suitable manner, for example by welding or by screwing.
• the wheel runout could have come in one piece with the hub.
• the wheel could be produced, not only in the form of a flat or openwork sail wheel, but also in the form of a spoke wheel, or also with a star arm, the ends of these arms being bent. to constitute support parts for rim profiles, these parts being similar, in section, to part 7 shown in FIG. 4, or having any other suitable shape.
• the number of pneumatic tires with which each wheel is provided is not limited to two or three.
• the front wheels can be provided with a Formula 1 racing car with three or four pneumatic tires and its rear wheels with five pneumatic tires.
• the width of the rims it is generally of the same order as that of the rims normally used for the same kind of vehicle.
• the pneumatic tires used in the context of the invention are therefore relatively narrow, their width being, for example, of the order of 10 to 12.5 cm.
• these pneumatic tires have the advantage of greater flexibility resulting from the fact that their side walls are thinner than those of wide section tires and that their height / width ratio has a value approaching that of unit, these tires have the advantage of a simpler manufacture and, consequently, of a lower price than that of pneumatic tires with large section, in particular special pneumatic tires with extra large section.
• each of the tires used improves the comfort of the vehicle thanks to better shock absorption resulting from irregularities in the road surface.
• the handling of the vehicle is also improved, in particular in difficult conditions, in particular in tight turns and on slippery road, in particular in the event of snow or ice.
• the temperature rises measured at different points of the tire, after prolonged use at high speed and under high mechanical stresses, are markedly reduced thanks to the use of wheels fitted with a plurality of pneumatic tires.
• valves of each or some of the tires mounted on the same wheel can advantageously be connected to a common valve in order to facilitate the inflation or deflation of the tires, which is particularly practical in the case of automobiles in common use.
• the invention does not include any limitation as regards the type of tire used.
• tires having a shape such that their contact surface with the present road, seen in section, a rounded shape rather than a flattened shape has advantages because it makes it possible to reduce the rolling resistance without affecting road holding thanks to the presence of a plurality of tires for each wheel.
• a pneumatic tire forming part of a plurality of tires mounted on a given wheel has an upper part, intended to come into contact with the road, having a section of general shape approximately triangular.
• This shape makes it possible to reduce the rolling resistance in a straight line to a minimum, while, in a bend taken at high speed, the pneumatic tire deforms so as to come into contact with the road by one of the lateral faces of its profile. triangular, which allows to obtain a very good grip on the road.

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

Priority Applications (1)

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Publications (1)

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ID=25686262

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Cited By (4)

Families Citing this family (5)

Citations (14)

• 1983
  • 1983-02-07 WO PCT/CH1983/000012 patent/WO1983002921A1/en unknown
  • 1983-02-10 FR FR8302130A patent/FR2521494A1/fr active Granted
  • 1983-02-15 IT IT8367165A patent/IT1212978B/it active

Patent Citations (14)

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