DE29521289U1 - Tire tread on pre-vulcanized tread - Google Patents

Description

20.09.1996 Applicant: Paul Rief, Lingenreute 175, 88145 Opfenbach

Pre-vulcanized tread for agricultural and forestry vehicles.

The invention relates to a pre-vulcanized profile tread for agricultural and forestry vehicles, the profile of which is formed by profile lugs that are spaced apart by gaps that extend from both tire shoulders, essentially transversely to the circumferential direction and approximately to the center of the tread. Full mold renewals in hot vulcanization molds are known. These molds profile the newly rubberized tire treads to the respective profile shape. To do this, it is necessary to produce a full mold for each tire size.

The task is to significantly simplify the re-rubbering of tire treads and to provide a profile tread that can be used for different tire sizes and widths.

According to the present innovation, this problem is solved by the technical teaching of claim 1.

The feature of the innovation is that the carcasses are covered with prefabricated profile treads, whereby several treads are used per tire, arranged one behind the other and/or next to each other, which are then connected to one another.

The advantage achieved with the innovation is that instead of a large number of different full molds for different tire circumferences, only one mold is required for the production of pre-pressed tread strips. By joining the

Treads in the circumferential direction and/or across the circumferential direction of the tire can cover different tire sizes. If the tire width is too large, additional filler strips can be used to fill larger gaps.

By resting the tread strips in the shoulder area and the reinforcement provided in this area, the studs are very stable at high speeds of up to 110 km/h. Another advantage of the invention is that the tread studs preferably extend beyond the actual tire width, which results in high traction in off-road use.

Embodiments of the invention are shown in the drawings:

Figure 1 shows a cross section through a tire where the tread is not yet on the carcass

rests on;
Figure 2 shows a tire with a

tread; Figure 3 shows a plan view of a first embodiment of the

tread according to the invention; Figure 4 shows a side view of the tread in

Arrow direction I in Figure 3; Figure 5 shows a section of a profile lug along the

Line II-II in Figure 3;
Figure 6 shows a tire with not yet on the carcass

two-part tread; Figure 7 shows a tire with a two-part tread placed on the carcass and connected to it.

tread;
Figure 8 shows a top view of a two-part

tread;
Figure 9 shows a plan view of a two-part tread with filler strips.

Figures 1 and 2 show schematically how the tread 2 is applied to the carcass 1 of the tire. It can be clearly seen that the tread is essentially flat and has a reinforcement 5 on the tire flanks S, with the tread sloping approximately at right angles towards the carcass on the flanks.

According to Figure 3, the tread 2 has, in a known manner, a tread of width L.

The tread has a profile consisting of profile lugs 4 spaced apart from one another by gaps 10.

The contact area of the profile lugs 4 is at most about 60% of the surface of the tread. The gaps 10 extend essentially parallel to the profile shape. The depth of the gaps increases from the center outwards towards the shoulder area S.

As can be seen in Figure 4, the walls of the tread lugs are inclined at an angle of approximately 30° to each other, i.e. at an angle C of approximately 15° to the tread normal.

The profile of the tread 2 can be asymmetrical with respect to the centre plane M of the tire. The profile lugs 4, which are spaced apart by the gaps 10, have an edge reinforcement 5 for stabilization, which, for example, forms a projection over the carcass width. The shoulder surface S that merges into the sidewall of the tire can be inclined outwards or towards the center of the tread, as shown in Figure 5. The flank of the support 5 in the shoulder area S preferably forms an angle between 70° (angle A) and 110° (angle A') with the contact surface, so that the reinforcement 5 can vary by an angle range oc = 40°.

Reinforcement 5, for example, consists of the elastomer used to manufacture the treads, which ensures good resistance to abrasion, cuts and punctures.

Figures 6 and 7 basically correspond to figures 1 and 2 but show a two-part tread consisting of a tread 2 and a tread 3. After the treads 2, 3 have been applied to the carcass (Fig. 7), the space 6 between the treads 2, 3 is filled with an elastomer filling. The advantage of using two treads is that they can be used for tires of different widths. The space 6 between the treads 2, 3, which is more or less wide depending on the tire width, is filled with filler.

Figure 8 shows a top view of two treads 2, 3 that are applied to the tire carcass 1 at a distance from one another. This creates a gap 6 that is filled with filler. The edges of the treads 2, 3 facing each other are serrated in the example shown so that the tread lugs 4 can fit on the treads 2, 3 along their entire length. However, if the treads 2, 3 are applied to the carcass at a sufficiently large distance, the edges of the treads 2, 3 facing each other can also be straight.

Figure 9 shows an example in which the treads 2,3 are applied to a very wide tire, so that the gap between the treads 2,3 is very large. It is therefore intended to arrange a filler strip 7 between the treads 2,3, which runs in the circumferential direction of the tire and preferably carries additional studs 8. The remaining gaps 9 between the treads 2,3 and the filler strip 7 are filled with filler in the manner described in order to create a connection between the treads 2,3 and 7.

Drawing as a guide

1 tire casing

2 treads

3 treads

4 profile studs

5 Reinforcement

6 Space

7 Filling strips

8 studs

9 Space

10 Gap (tread base) A,A' angle

C angle

L Tread width

M center line

P Stud spacing

S shoulder area

cc angle

Claims (5)

20.09.1996 Applicant: Paul Rief, Lingenreute 175, 88145 Opfenbach Protection claims 1. Pre-pressed profile tread for agricultural and forestry vehicles, the profile of which is formed by profile lugs which are spaced apart by intermediate spaces extending from both tire shoulders and extending essentially transversely to the circumferential direction and approximately to the center of the tread, characterized in that one or more treads (2, 3) are joined together in the circumferential direction and optionally transversely to the circumferential direction of the tire to form an overall tread, the spaced apart profile lugs (4) each being provided with supports (5) in the region of the tire shoulder (S), which, when the tire is not loaded, form an angle (A, A') of 70° to 110° with the contact surface of the tread. 2. Tread strip according to claim 1, characterized in that the tread lugs (4) in the shoulder region (S) run transversely to the circumferential direction and in the adjoining tread region at an angle of 25° to 70° to the circumferential direction of the tire, have a depth increasing from the center region to the shoulder region and are spaced apart (P) between approximately a quarter and half the tread width (L), the area of the tread lugs being at most 60% of the area of the tread. 3. Profile tread according to claim 1 or 2, characterized in that a remaining gap (6) between the adjacent profile treads (2, 3) is filled with a filler strip (7). STR - J:\WINWORD\ANMELDG\R691.DOC - 19.09.96 • 4 · · · &PSgr;&PSgr;&PSgr; 4. Profile tread according to claim 3, characterized in that the filler strip (7) has studs (8). 5. Profile tread according to one of claims 1-4, characterized in that a remaining gap (6,9) between the adjacent profile treads (2,3) and/or a filler strip (7) is filled with a filler.