DE1505141B

DE1505141B - Pneumatic vehicle tires with a radial carcass, the ends of the carcass guided around the bead cores only forming a short, radially upwardly directed turnup

Info

Publication number: DE1505141B
Authority: DE
Inventors: Giuho Longaretti Luciano Mailand Cappa (Italien)
Original assignee: Industrie Pirelli SpA, Mailand (Italien)

Description

aus mehreren Lagen zusammengesetzt sein kann. Die gesamten Lagen der Karkasse verlaufen axial innerhalb des Wulstkerns 3, werden nach außen umgelegt und bilden die Umschläge 4. Zwischen den Lagen und den Umschlagen befindet sich der erfindungsgemäße Kernreiter S, dessen Querschnitt sich radial nach oben verjüngt und dessen Basis sich auf dem Wulstkern 3 abstützt. In Fig. 1 deutet der Buchstaben die Höhe des unteren Seitenwandbereichs und der Buchstabe h die Mindesthöhe an, über welche sich der Kernreiter 5 erstreckt. Bei dem dargestellten Ausführungsbeispiel ist das Verhältnis von hzaH gleich 0,75.can be composed of several layers. The entire plies of the carcass run axially inside the bead core 3, are turned over to the outside and form the folds 4. Between the plies and the folds is the apex S according to the invention, the cross section of which tapers radially upwards and the base of which rests on the bead core 3 supports. In FIG. 1, the letter indicates the height of the lower side wall area and the letter h indicates the minimum height over which the apex 5 extends. In the illustrated embodiment, the ratio of hzaH is 0.75.

F i g. 2 zeigt einen Teilquerschnitt der Seitenwand eines Luftreifens gemäß einer weiteren Ausführungswelcher der Kernreiter 5 sichF i g. Figure 2 shows a partial cross-section of the sidewall of a pneumatic tire according to a further embodiment the apex 5 itself

tfSiltfSil

ner wei gner Wei g

^n_gsformDieser Luft reifen wexdfc von dem in Fie 2 dargestellten in bezug auf die Ho&e des Kemreiters 5 ab der sich nur in den unteren SeitenwSerSch⁵ Streckt, wobei das Verhaltes von/, zu H wie in F i g. 1 ebenfalls gleich 0,75 ist.mature ^ n _g sformDieser air wexdfc from that illustrated in Fie 2 with respect to the Ho & d of Kemreiters 5 in which only the lower SeitenwSerSch Stretches ^5, wherein the Verhaltes of / as g in H to F i. 1 is also equal to 0.75.

Hierzu 1 Blatt Zeichnunge-1 sheet of drawings

Claims

1 2 are to withstand Druckbeanspnichungen, whereby claims: again the occasion for breaks and layer solutions is given.

1. Pneumatic vehicle tire with a reinforcement There is also a pneumatic tire with a radial carcass insert in the tread D area, a bead core 5 is known, in which a bead and additionally in each bead and a reinforcing strip of greater hardness provided from bead to bead extending carcass is essentially, wherein the carcass plies are arranged between the Kernreilichen radially extending threads or wires, ter and this reinforcing tire, with the ends of the carcass axially from the inside bottom and top tapering cross-section and has its smallest thickness in the diglich a short, radially upwardly directed region of the bead core. Forming an envelope, characterized thereby, such a design is not able to solve the problem underlying the bead core (3) because in the known manner a tire known from a rubber compound is the outer reinforcement strips confessed and from its greatest strength in the 15 rade at that point at which the largest area of the bead core verjüii- transverse bending forces occur radially upwards near the bead, its gender core (5) is arranged and that has the smallest cross section. In addition, there is a risk of breakage and height (ti) of about one third of the height of the un- ply of the apex (5) up to a radial minimum - this known tire , since the turned-over carcass liner extends sidewall area (H) and the 20 gen between the apex and the outer rubber compound of the apex (5) a larger strength strip of greater hardness and at a distance hard than all other used in the tire are arranged from each other.

Has mixtures. The task, the lateral stability of radial tires

2. A pneumatic tire according to claim 1, characterized in that it has already become a known development that the apex (5) is up to 25 manure, with a minimum height (h) of 50 ° from 0 to 100 ° in the lower side wall area 0 which the radial layers of the carcass are replaced by layers of crossed height of the lower side wall area (H) he thread directions, which, however, stretches opposite. the design according to the invention an increased

3. Pneumatic tire according to claim «or 2, which means manufacturing costs.

characterized in that the apex (S) at its 30 The object of the invention is under

Base in the area of the bead core ^ 3) in two parts maintaining the heat of a pneumatic tire according to the

(6 and 7) is split between which the preamble of claim 1 given simple

Envelope (4) of the carcass (2) is inserted. Design and advantages "in terms of driving comfort to design this in such a way that the lateral stability

35 did improved and ply solutions and breaks the

Carcass avoided in the area of the rim flange

will.

This object is achieved by the invention specified in claim 1.

Pneumatic tires according to the preamble of claim 1 are 40 further useful embodiments of the Erunter Load action can be deformed to a relatively high degree, what a invention are described in the subclaims, On the one hand, it is advantageous for driving comfort, on the other hand, the training side characterized in claim 3 for the absorption of transverse forces the disadvantage formation form the particular advantage of a fixed prohibition, that has the possible maximum of lateral anchoring of the folded carcass ends and mngskraft is not attainable. In addition, the large 45 results in the occurrence of fatigue fractures on a mini stiffness difference between that reduced by the domain.

genhorn-supported bead area and the re-The pneumatic tire according to the invention has a

bigen lower side wall area in this exaggerated transverse stability, without the other V ^ r-

transition zone easy to fractures or loosening of layers. parts of a tire with a radial carcass, in particular

It is indeed already known per se to adversely affect driving comfort on the other. A

To arrange bead cores apex, which lies in the further advantage achieved by the invention

part of the side wall and extend onto this in that the carcass ply or the carcass plies

Way the aforementioned differences in stiffness are not subjected to pressure loads,

to the. However, in these known training, the invention is illustrated in the drawing with reference to FIG

gen the apex between the plies of the carcass 55 exemplified embodiments explained,

introduced, which has the disadvantageous consequence that an Ab- F i g. 1 shows in cross section a pneumatic tire according to

dissolve the layers at the edges of the apexes carried out an embodiment of the invention;

gen can. Since this is due to the bead F i g. Fig. 2 shows in cross section the side wall of a

Core and apex reinforcements formed by a lot of air tire according to a further embodiment

60 of the invention is more rigid than the surrounding layers;

neutral axis through the reinforcements. As a result of the F i g. 3 shows another embodiment of the spatial Separation of the layers is made in the defor- mation.

mings of the tire while driving under load of the in F i g. 1 shown in cross section

The state of tension in the inner layers is increased, with an annular inextensible

rend he is reduced in the outer layers or provided to 65 reinforcement insert 1 (belt), which is below the

Becomes zero; It is possible that the threads of the au tread are arranged and have one of them radially

ßen.n layers reach a state of compression, running threads on existing carcass 2, the

which is very harmful because the threads are not formed by a single layer, but that too