FR2655920A1 - PNEUMATIC VEHICLE. - Google Patents

Abstract

The invention relates to a rolling surface profile, linked to the direction of rotation, for vehicle tires with a radial carcass. The profile consists of rib-shaped elements (8,9) and corresponding diagonal groove-shaped elements (2,3) which are arranged in the shape of an arrow and which have an elbow (4,5) in a shoulder region (6, 7) of the tire; parallel to the ribs and grooves of the profile in the shoulder area, there are partly or continuously transverse notches (20,21) of small width, which improve the safety in wet skidding and the noise level of the profile of the running surface.

Description

The present invention relates to a vehicle tire of the type

  radial carcass, provided with a rolling surface profile connected to the direction of rotation and which comprises a large number of rib-shaped elements which are obliquely oriented at an acute angle with respect to the circumferential median line xx of the tire and also grooves of the profile which are oriented substantially parallel to the ribs and which comprise a bend in a shoulder zone In this

  rolling surface profile, ribs and grooves

  are half of the surface area

  This rolling bearing is oriented in opposite directions with respect to those of the other half of the running surface and is thus arranged in a V-shape. According to the patent application filed in France under No. 8913098 on 6 October 1989, the profile groove is located at its beginning in an area of the circumferential median line of the tire and is arranged with respect to this median line at an oblique orientation angle "corresponding to a fairly strong inclination The rib-shaped profiled elements are interconnected by parts of

  located in an area of the median line circumscribed

  tire feral The beginnings of the grooves of

  profile are further mutually offset in the direc-

  circumferential circumference The elbow of the profile grooves is located at the boundary between the central area of the surface

  rolling surface and the shoulder area of the road surface.

  The profile grooves of the shoulder region therefore have an angled profile at an angle of 95 to 1350, measured with respect to the corresponding middle of the profile groove, and they terminate in condition.

  opening in the tire shoulder.

  In the vehicle tire being subject

  of the main patent, drainage is therefore improved.

  and simultaneously obtain a noise emission relating to

  When tires of such vehicles are arranged as wide tires having a height / width ratio of 0.6 or less,

  then obtains according to the invention, with regard to

  the safety of wet skidding, an improvement without the safety of dry skidding,

  the absorption of lateral forces and also the insensi-

  rail guiding is adversely affected, this result being achieved in accordance with

  the invention by the fact that the elements of the profile com-

  at least partially at least partially transverse notches of about 0.45 mm to 2.5 mm which are oriented substantially parallel to the ribs or profile grooves in the shoulder region and which are arranged in V shape over the entire width of the surface

rolling.

  In vehicle tires having a relatively large width, it is possible for

  vehicle speeds, that there are problems

  when braking when existing on road surfaces, possibly not rough,

  relatively thin water films or

  In order to provide in this respect the necessary value of wet skid safety for the vehicle tire, the profile elements arranged with an elongated structure V-shaped are provided with the many transverse notches mentioned above, so as to act thus a large number of radial edges The transverse notches can intervene partially and further with a partial or complete section Under the effect of radial edges

  additionally existing, any wet zone

  or layer of water on the ground support surface which creates a decrease in soil adhesion, is

  subject to multiple division or ejection.

  In addition, under the effect of transverse notches

  planned, the transition zone between the profile of

  and the rib is made more flexible The radial edges, now existing additionally, cross-cut and the greater flexibility of the elements of the profile, especially in the shoulder area,

  constitute appropriate means to improve the security of

  These means also produce a reduction in the noise peaks produced by the tire so that a reduction in the level of noise produced by the tire is achieved.

  noise compared to the profile of the main patent.

  Because the transverse notches provided in the two halves of the running surface are arranged in

  being directed towards each other, we are now

  additionally holding another characteristic of dividing the profile of the running surface with respect to the arrow-shaped arrangement, which is defined by the ribs and grooves of the profile, so that

  the arrow-shaped orientation of the transverse notches

  assists them in the shape of arrow of the ribs

  and profile grooves that exist as before.

  The transverse notches can be made

  For example, they may extend over a length corresponding to two-thirds of the width of the shoulder profile or the rib profile. However, they may also extend transversely continuously in each of the aforementioned elements of the profile. They can, at least in different areas, have different widths and / or different depths. This means that, in the shoulder zone, and depending on the design of the wide tire, they can be respectively wider and narrower by comparison to the notches

transverse of the central zone.

  4. The depth of the transverse notches is notably smaller than the normal profile depth and it advantageously rises to about half of the profile depth. This is a function of the size of the tire and in particular of its width.

  In a central area of the profile, additional

  each link part of the profile elements, in

  which join the elements of the surface profile.

  this rolling which are arranged in arrow shape, is

  divided by another transverse notch, which is

  in the longitudinal direction of the grooves of the profile.

  This gives a suitable decomposition of the profile of the

  rolling surface in the central area of this

Niere.

  Other features and advantages of the

  will be highlighted in the rest of the

  description, given by way of non-limiting example, in

  FIG. 1 shows a rolling surface profile having V-shaped profile grooves with steep inclination and shows a partial arrangement of transverse notches which are oriented parallel to the shoulder profiling, FIG. 2 shows a rolling surface profile similar to that of FIG. 1 and having transverse notches arranged in the shape of a V and extending over

  the total widths of the halves of the wheel surface

  FIG. 3 is a detailed sectional view of a transverse notch, the section being taken along the line

A-A of Figure 1.

  The tread surface profile 1 of FIG. 1 is provided for wide tires having a height / width ratio H / B less than or equal to 0.6. The profile comprises grooves 2, 3, oriented at an angle C 1 comprised between 120.degree. and 450 relative to the median plane xx, each groove having portions 8,9 inclined at another angle p from a bend 4, t in a shoulder zone 6, 7 of the tire These grooves of the profile are created by ribs 10, 11 of the profile which are arranged in the shape of a V or arrow, which meet in the central zone 12 and which are connected

  between them by connecting portions 13 of the profile.

  The profile of the running surface in the zones of shoulders 6 and 7 consists of blocks 16, which are essentially formed from the respective edges of the two edges 14, 15 of adjacent grooves of the profile. These blocks are each divided into a form

  forked by one or more oblique grooves 17.

  The rolling surface profile, consisting of ribs and V-shaped ribs and arranged with a relatively steep slope, additionally comprises

  in each shoulder block 16 transverse notches

  the 20, 21 at least partially formed and partly quite long or short enough and it also includes

  in the ribs of the profile elements 10, 11 of the

  These transverse notches are oriented essentially at the angle y, which is decisive for the orientation of the ribs in the shoulder profile. In this way, a large number of radial edges are created and the rigidity of the block

  16 in the transition zone with a rib

  re of the profiled element is thus reduced.

  The width of the transverse notches 20 to 23

  is between 0.45 mm and 2.5 mm The notches

  centrally pour the shoulder block and, in the extension, they also cross the rib of

  the profiled surface element that is available

  in the center with a steep slope The transverse notches

  Dirty ends respectively in the diagonal groove 2 or 3 of the corresponding half of the running surface The width b of the transverse notches is determined by the width of the shoulder block 16 For a relatively narrow shoulder block, the width b the transverse notch is for example between about 0.75 and 1 mm For a shoulder block of average width, the notch width will rise for example to about 1.5 mm For a relatively large shoulder block wide, the transverse notch width b will be raised by

example at 2.0 mm.

  The depth of the transverse notches is variable. It is, for example, between 0.5 and 0.8 times the conventional depth of the grooves of the profile. In order to maintain the stability of the profile element, it is possible for the depth of the transverse notch is comparatively small in specific areas, but nevertheless selectable For example the section can be shaped in the form of an embankment

  other areas, the whole depth is involved.

  The rolling surface profile 30 of FIG.

  re 2 has ribs and grooves which are arranged in the form of an arrow as in FIG.

  In this case, the transverse notches start in the shoulder.

  31 of the tire, they continue through the shoulder block 32 and end in the rib of the profile element 33 transverse notches are designated 40, 41 in an area of half the

  They have a corresponding depth

  at half the total depth of the profile.

  The width of the transverse notches depends on the size of the dimensioning of the block portion 34

  of shoulder For average dimensioning of the shoulder block

  the width of the transverse notch is included

for example between 1 and 1.5 mm.

  Because the transverse notches extend

  tooth in the two halves of the running surface, there is obtained in this case an additional structure in the form of arrow corresponding to the angle Y This structure is in harmony with the structure in the form of steep arrow, which is created by the ribs and the grooves of the profile, and it assists this structure in the rolling direction L. Narrow notches 42, 43 provided in the extension of the grooves 33, 36 of the profile produce a

  another division of zone 37 of the profile in the central part

trale of the latter.

  FIG. 3 represents a sectional view made

  line A-A and showing that the transverse notches

  dirty are relatively narrow and are

  with half the height of the profile.

Claims (7)

  1 Pneumatic vehicle of a carcass type having   dial e, having a bound rolling surface profile   in the sense of rotation, which includes a large number of   profile elements in the form of ribs oriented obliquely   and at an acute angle to the circumferential median line   and the grooves of the profile oriented substantially parallel to the ribs and having layers in a pneumatic shoulder zone in which the ribs and the grooves of the profile located in one half of the running surface are oriented in opposite directions. those of the other half of the running surface and in which the profile groove is situated at its beginning in an area of the circumferential median line of the tire and is arranged with respect to this median line at an acute angle φ (d oblique orientation and the rib-shaped profile members are interconnected by connecting portions located in an area of the circumferential median line of the tire, the starts of the profile grooves being mutually offset in the circumferential direction, while the elbow of the profile grooves is located at the boundary between the area   center of the running surface and the shoulder area-   of the running surface and that the ribs of the shoulder profile are curved at an angle p of 95 to 1350 measured with respect to the middle of the groove, and terminate in the open condition in the tire shoulder, characterized in that the profile elements (6, 10, 11) comprise at least partially at least partial transverse notches (20, 21, 22, 23; 40, 41) having a width (b) between   0.45 mm and 2.5 mm, these notches being oriented   parallel to the profiled elements (14, 15, 8, 9) of the shoulder region (6) and arranged in a V-shape, considering them over the width of the running surface. Vehicle tire according to claim 1, characterized in that the transverse notches extend over a length corresponding to two-thirds of the width of the profiled elements.   Vehicle tire according to claim 1, characterized in that the transverse notches are   performed continuously in each profiled element.   4 Pneumatic vehicle according to one of the claims   1 to 3, characterized in that the transverse notches they have different widths.   Pneumatic vehicle according to one of the claims   1 to 4, characterized in that the transverse notches   they have different depths.   Vehicle tire according to claim 5, characterized in that the depth is different in the   transverse direction and / or in the circumferential direction -competitive.   Pneumatic vehicle according to one of the claims   1 to 6, characterized in that the profiled elements comprise, in a central zone (12), portions of   link (13) which are divided by transverse notches   (42, 43) having a width of between 0.45 mm and   2.5 mm and which are oriented transversally to the cross-sections (20, 22).   8 Pneumatic vehicle according to one of the claims   1 to 7, characterized in that the transverse notches   (20) are arranged in the middle in an element profile (14).   9 Pneumatic vehicle according to one of the claims   1 to 8, characterized in that the transverse notches   (20) are disposed at least in part so as to   eccentric in a profiled element (14).