PatentDe  


Dokumentenidentifikation EP1491324 21.06.2007
EP-Veröffentlichungsnummer 0001491324
Titel Verfahren und Vorrichtung zum Aufbauen von Rohreifen
Anmelder Sumitomo Rubber Industries Ltd., Kobe, Hyogo, JP
Erfinder Nakata, Norikatsu, Kobe-shi Hyogo-ken, JP;
Hakamada, Akio, Kobe-shi Hyogo-ken, JP;
Yoshida, Yutaka, Kobe-shi Hyogo-ken, JP
Vertreter Manitz, Finsterwald & Partner GbR, 80336 München
DE-Aktenzeichen 602004006339
Vertragsstaaten DE, FR, GB
Sprache des Dokument EN
EP-Anmeldetag 16.06.2004
EP-Aktenzeichen 040141327
EP-Offenlegungsdatum 29.12.2004
EP date of grant 09.05.2007
Veröffentlichungstag im Patentblatt 21.06.2007
IPC-Hauptklasse B29D 30/26(2006.01)A, F, I, 20051017, B, H, EP
IPC-Nebenklasse B29D 30/30(2006.01)A, L, I, 20051017, B, H, EP   B29D 30/58(2006.01)A, L, I, 20051017, B, H, EP   

Beschreibung[en]
BACKGROUND OF THE INVENTION Field of the Invention

The present invention relates to a raw tire forming apparatus and a raw tire forming method capable of precisely and efficiently pasting a tread ring to a raw tire base body, enhancing the uniformity of a finished tire and enhancing the productivity, according to the pre-characterizing part of claim 1 and of claim 4, respectively.

Prior Art

As shown in Fig. 7, in a producing step of a raw tire (tire before vulcanization) in a radial tire, it is necessary to paste a cylindrical tread ring A to a raw tire base body B which is expanded in a toroidal shape. According to a normal pasting method, a rotatable disk e which is called a tread stitcher is pushed against the tread ring A, the raw tire base body B is rotated and in this state, the disk e is gradually moved outward in the axial direction of the tire and inward in the radial direction, thereby pasting the entire tread ring A.

In the stitching method using the disk e, the carcass cord is deviated from the radial direction by twist caused by rotation torque, an angle in the lateral direction is different in the belt cord, and the uniformity of a finished tire is adversely influenced. Since the shoulder side portion of the tread ring A is gradually pushed down, it takes time for pasting the tread ring A, and the productivity of the raw tire is deteriorated.

Solutions of this problem have been proposed in patent document 1 (Japanese Patent Application Laid-open No. S60-132745), patent document 2 (Japanese Patent Application Laid-open No. 2003-071947) and patent document 3 (Japanese Patent Application Laid-open No. 2003-071948).

According to the patent document 1, however, a wide tread ring integrally provided with a sidewall rubber is used to prevent a tread edge from becoming cracked. Thus, it is necessary to crimp a wide region in the vicinity of the bead portion. Therefore, it is necessary to increase the expansion coefficient of the tube bladder, but if the expansion coefficient is increased, a large difference is prone to be generated in the expansion coefficient on the circumference, and the pasting operation can not be carried out uniformly in some cases.

In the patent document 2, since the bladder is held by a cramp member, concentric severity is high because of positional relation between the clamp body and a raw tire base body. Thus, even if there is a small deviation in concentric state, variation is generated in the cramping force, the tread edge meanders and the quality is adversely affected. Since the center of the bladder is deviated toward the tread with respect to the center of the clamp member, there is an adverse possibility that air remains below the tread ring.

In the patent document 3, since the rigidity is changed depending upon a portion of the tube, it is necessary to enhance the precision of a part of the tube and to precisely control the position where the tread ring starts abutting. Thus, it is important to form the tube precisely and to perform a high level maintenance. Since the clamp is fixed, there is a problem that concentric severity is high like the patent document 2.

In any of the patent documents 1 to 3, the step for moving the pasting apparatus to a predetermined position to crimp after the tread ring is transferred to the raw tire base body requires the same installation space and the cycle time of step as those of the conventional technique like the conventional disk.

An apparatus according to the pre-characterizing portion of claim 1 and a method according to the pre-characterizing portion of claim 4 are disclosed by EP-A-0071838. Further raw tire forming apparatuses and raw tire forming methods are disclosed by US-A-5413653, US-A-5486260, US-A-4178198 and JP 60-132745 A.

SUMMARY OF THE INVENTION

It is an object of the present invention to provide a raw tire forming apparatus and a raw tire forming method capable of precisely and efficiently paste a tread ring to a raw tire base body while reducing the installation space and step cycle time without requiring high precision of the rubber tube body itself and of the mounting operation of the rubber tube body.

This object is achieved by an apparatus according to claim 1 and a method according to claim 4.

Particular embodiments of the invention are the subject of the respective dependent claims.

BRIEF DESCRIPTION OF THE DRAWINGS

  • Fig. 1 is a side view showing an embodiment of a raw tire forming apparatus of the present invention;
  • Fig. 2 is a front view thereof;
  • Fig. 3 is an enlarged sectional view of a pasting means;
  • Fig. 4 is a sectional view of an operating state of the pasting means;
  • Fig. 5 (A) is a front view of a rubber tube body, Fig. 5 (B) is a diagram showing one example of a mounting state of the rubber tube body, and Fig. 5 (C) is a diagram showing another example of the mounting state;
  • Figs. 6(A) and (B) are schematic sectional views of a tread ring and a raw tire base body; and
  • Fig. 7 is a diagram for explaining a conventional technique.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

An embodiment of the present invention will be explained with reference to the drawings.

Fig. 1 shows a raw tire forming apparatus 1 of the present invention. The raw tire forming apparatus 1 is disposed between a tread ring forming drum 2 which forms a tread ring A, and a former 3 which expands a raw tire base body B from its cylindrical shape into a toroidal shape.

The raw tire forming apparatus 1 transfers the tread ring A received from the tread ring forming drum 2 onto the former 3 while aligning the tread ring A with an outer periphery of the raw tire base body B on the former 3. The raw tire forming apparatus 1 also pushes an inner peripheral surface of the tread ring A against the toroidal raw tire base body B and pastes the same. That is, the raw tire forming apparatus 1 of the present invention functions as a transfer which transfers the tread ring and as a stitcher for pasting the tread ring. Thus, the conventional special pasting apparatus can be eliminated and the installation space can effectively be utilized.

Here, the tread ring forming drum 2 is of a known structure having a rotatable drum whose diameter can be reduced. A tread constituent member including a belt ply a1 and a tread rubber a2 is wound on the drum 2A, thereby forming the annular tread ring A (shown in Fig. 6(A)).

In this embodiment, the former 3 is a single former of a known structure used in a so-called single stage forming method. A tire member including a carcass ply b1 is wound in sequence, and a cylindrical raw tire base body B (shown in Fig. 6(B)) is formed. In the drawings, reference number b2 represents an inner linear rubber, reference number b3 represents a bead core, reference number b4 represents a bead apex rubber, and reference number b5 represents a sidewall rubber. The former 3 may be a second former used in a two stage forming method. In such a case, a raw tire base body B which is separately formed on the first former is provided on the former 3.

Next, the raw tire forming apparatus 1 includes a ring-like base body 5 which moves between the tread ring forming drum 2 and the former 3 which are concentrically disposed, and a pasting means 6 supported by this ring-like base body 5 as shown in Fig. 1. The pasting means 6 includes a grasping tool 11 capable of grasping the tread ring A, and a pushing-down pasting tool 12 which pushes down the tread ring shoulder side portion As and pastes the same on the toroidal raw tire base body B.

In this embodiment, the ring-like base body 5 is an annular body which is concentric with the former 3. The ring-like base body 5 has a rectangular cross section comprising an inner peripheral plate portion 7 and an outer peripheral plate portion 8 connected with each other through side plates. The ring-like base body 5 is provided at its lower end with a running-stage 10 which can run along rails 9 provided between the tread ring forming drum 2 and the former 3. Thus, the ring-like base body 5 can relatively move with respect to the former 3 in an axial direction of the tire.

The grasping tool 11 includes a plurality of segments 13 which can move forward and backward in a radial direction. If the segments 13 move forward, i.e., inward of an inner surface of the ring-like base body 5, the segments 13 abut against the outer peripheral surface of the tread ring A and grasp the tread ring A. Although the segments 13 are supported by a rod end of a cylinder 14 fixed to the inner peripheral plate portion 7 in this embodiment, the segments 13 may be supported by any of known diameter-reducing mechanism such that the segments 13 can move while reducing the diameter.

Next, the pushing-down pasting tool 12 includes an expandable annular rubber tube body 15 disposed on each side of the segment 13 as shown in Fig. 3. In this embodiment, the pushing-down pasting tool 12 includes a guide tool 16 which guides the expansion of the rubber tube body 15.

Each rubber tube body 15 is a soft annular body having a circular cross section and a rubber thickness of 1 to 4 mm. The rubber tube body 15 continuously extends in a circumferential direction of the tire. As shown in Fig. 5 (A), 2 to 5 bolt-like mounting hardware 20 including air valves 20A are projecting from an outer peripheral edge of the rubber tube body 15 at distances from one another in the circumferential direction. The mounting hardware 20 other than the air valves 20A is fixed to the rubber tube body 15 by welding or the like. As shown in Fig. 5 (B), the mounting hardware 20 is mounted on the ring-like base body 5 with play therebetween using a double nut or the like.

As another mounting method, as shown in Fig. 5(C), the mounting hardware 20 other than the air valve 20A may be fastened using a rubber band-like fastening cord 21 with play with respect to the ring-like base body 5. In that case, the fastening cord 21 is preferably easily expandable and has lower elasticity than the rubber tube body 15. In any cases, the rubber tube body 15 is supported at a point, and the rubber tube body 15 is mounted such that it can inclined around the supporting point by play and it can easily be deviated in position.

As shown in Fig. 3, the guide tool 16 is formed into a V-shape having an inner guide piece 16i and an guide piece 16o each extending in the circumferential direction on each side of the rubber tube body 15. The inner and outer guide pieces 16i and 16o incline in directions from radially outside to inside such as to separate away from the rubber tube body 15. At that time, it is preferable that an inclination angle &agr;1 between the inner guide piece 16i and the axial direction of the tire is in a range of 50 to 90°, an inclination angle &agr;2 between the outer guide piece 16o and the axial direction of the tire is in a range of 30 to 70° and is equal to or smaller than the inclination angle &agr;1, and the guide tool 16 guides such that the rubber tube body 15 expands outward as possible in the axial direction of the tire.

At the position of the tread ring forming drum 2, the segments 13 of the raw tire forming apparatus 1 are allowed to advance radially inward and to abut against the outer peripheral surface of the tread ring A on the tread ring forming drum 2. With this, the tread ring A is received from the tread ring forming drum 2 and grasped (grasping step). When the tread ring A is received, the tread ring forming drum 2 reduces its diameter to release the tread ring A.

Then, the raw tire forming apparatus 1 is allowed to move to a predetermined position of the former 3 along the rails 9, and the grasped tread ring A is aligned with the raw tire base body B on the former 3 (aligning step). In this state, the raw tire base body B on the former 3 is expanded from its cylindrical shape into the toroidal shape by charging the internal pressure. At that time, as shown in Fig. 3, a central portion of the grasped tread ring A comes into contact with a central portion of the toroidal raw tire base body B under pressure and is pasted (expansion step).

Thereafter, the diameter-reduced state of the segment 13 is maintained, and in this state, the internal pressure is charged into the rubber tube body 15 of the pushing-down pasting tool 12, thereby largely expanding the rubber tube body 15 as shown in Fig. 4. With this, the tread ring shoulder side portion As is pushed down and is pasted on the raw tire base body B (pasting step) . At that time, the expansion of the rubber tube body 15 is limited and guided by the inner and outer guide pieces 16i and 160.

Here, a bladder, a rubber tube and the like are made of rubber. Therefore, when it expands from its weak (thin) film portion and it naturally expands eccentrically. This eccentrically or unevenly expanded portion first pushes the tread ring or strongly pushes the tread ring. At that time, if a reinforcing layer or the like is inserted into the rubber tube and fixed without play, since a side of the rubber tube is deformed easily and a force can not be released, and the tread ring is pushed unevenly, the tread edge portion meanders and the uniformity is adversely affected.

In this embodiment, the rubber tube body 15 is mounted with play so that the rubber tube body 15 can easily be deviated in position. Thus, when the unevenly expanded portion is generated and such portion tries to come into strong contact with the tread ring A, the rubber tube body 15 itself moves (changes its attitude) and the uneven force can be released. That is, even when stress variation in the circumferential direction or radial direction is generated in the rubber tube body 15 in some cases, the rubber tube body 15 itself moves to release the force as it is expanded, the reaction force allows it to be centered automatically with respect to the tread ring A, and the auto-correcting function can be exhibited.

Therefore, the pushing-down pasting tool 12 can precisely paste the tread ring A and the raw tire base body B with high quality. Further, the rubber tube body 15 does not require high part precision and assembling precision, and there is a merit that a shape and a structure having a simple circular cross section can be employed as the rubber tube body 15. The pushing-down pasting tool 12 expands the rubber tube body 15 while pushing the central portion of the tread ring A by the segments 13. Therefore, air below the tread ring A can be released toward the tread edge, and it is possible to reliably discharge the remaining air from the entire region including the central portion. Since the pasting operation can be carried out simultaneously with the transfer of the tread ring A into the raw tire base body B, the operation time can be largely reduced, and also the step cycle time can be reduced largely.

As shown in Fig. 3, a distance L1 in the axial direction of the tire between the segment 13 and a tip end of the inner guide piece 16i is preferably greater than 0 mm and equal to or smaller than 10 mm. If the distance L1 is 0 mm or less, when the segment 13 advances or retreats, it collides against the inner guide piece 16i. If the distance L1 exceeds 10 mm, there is an adverse possibility that air remains in this distance L1.

In a standard state in which 1 atmospheric pressure is charged into the rubber tube body 15, the cross section thereof is substantially circular in shape, the cross section diameter d of the rubber tube body 15 is preferably in a range of 25 to 100% of the tread width TW of the tread ring A (shown in Fig. 6(A)), and a distance L2 in the axial direction of the tire between the cross section center and an outer end of the widest belt ply a1 is preferably in a range of -5 to +10 mm (outer side from the outer end in the axial direction of the tire is +). If the cross section diameter d is smaller than -25% and if the distance L2 is smaller than -5 mm, a rubber tube body 15 having a large expansion coefficient is required for pasting it up to the tread edge, the endurance strength of the rubber tube body 15 is lowered, and it takes time to charge the pressure. If the cross section diameter d exceeds 100%, the apparatus is increased in size, the installation space can not be utilized effectively, and it takes time to charge the pressure. If the distance L2 exceeds +10 mm, air is prone to remain in the tread ring shoulder side portion As. When the cross section diameter d is not a perfect circle, a diameter of the smallest perfect circle in a perfect circle capable of surrounding the cross section of the rubber tube body 15 (except air valve) is defined as the cross section diameter d.

In this standard state, the inner diameter D1 of the rubber tube body 15 is preferably in a range of 100 to 110% of the outer diameter D2 of the tread ring A. If the inner diameter D1 exceeds 110% of the outer diameter D2, a rubber tube body 15 having a large expansion coefficient is required, the endurance strength of the rubber tube body 15 is lowered, and it takes time to charge the pressure.

A charging internal pressure P1 of the rubber tube body 15 is preferably 20 to 95% of a charging internal pressure P2 of the raw tire base body B, and more preferably 30 to 80%. If the charging internal pressure P1 is smaller than 20% of the charging internal pressure P2, the pushing-down force of the tread ring shoulder side portion As is insufficient, or the pushing-down force against the raw tire base body B is insufficient, and there is an adverse possibility that the pasting operation can not be carried out reliably. If the charging internal pressure P1 exceeds 95% of the charging internal pressure P2, the raw tire base body B is deformed or the like when the pasting operation is carried out.

In this invention, the charging internal pressure P2 of the raw tire base body B can be reduced to about 30 to 80% (e.g., 42 to 112 kPa) of the conventional stitching system (shown in Fig. 7) using a disk e. Thus, deformation of the raw tire base body B caused by this charging internal pressure P2 can be suppressed.

In the case of the conventional stitching system, the charging internal pressure P2 of the raw tire base body B is usually set to a value as high as about 140 kPa, and the pushing force of the disk 3 is set to a value as high as about 140 kPa. This is because that if the charging internal pressure P2 is lower than P3, the raw tire base body B is pushed by the disk e and is deformed inward. If the pushing force P3 is 140 kPa or lower, a crimping force becomes excessively weak, the tread ring jumps and returns and the pasting operation can not be carried out. To prevent this, it is necessary to extremely reduce the rotation speed of the raw tire base body B, and the operation efficiency is largely lowered. Thus, the charging internal pressure is set to the high pressure.

In this embodiment, however, the raw tire base body B is not rotated and pushed on the circumference at a dash and thus, it is possible to push strongly within sufficient crimping time. Therefore, the charging internal pressure P1 of the rubber tube body 15 can be set to a low value while reliably carrying out the pasting operation, and the charging internal pressure P2 of the raw tire base body B can also be reduced.

Although the especially preferred embodiment of the present invention has been described in detail, the invention is not limited to the embodiment, and the invention can variously be modified.

Example

Ten raw tires in which tread rings and raw tire base bodies are pasted on each other were formed using the conventional stitching apparatus (Fig. 7) using the raw tire forming apparatus and the disk e of the present invention shown in Fig. 1, the raw tires were vulcanized and formed, the uniformity (RFV, LFV), air remaining state under the tread ring, and the pasting operation time of the finished tires (size of 145/65R13) were compared, and result thereof are shown in Table 1. The specifications other than the pasting methods of the tread rings in the examples of the present tires and the conventional tires are the same. The specification of the raw tire forming apparatus is shown in Table 2.

(1) Uniformity:

In accordance with JASOC607, RFV (radial force variation) and LFV (lateral force variation) of the ten prototyped tires were measured under the conditions of rim of 13×4 . 5J, internal pressure of 200 kPa and a load of 2.4 kN, and the average values thereof were indicated with indices where a comparative example is 100. A lower index shows more excellent uniformity.

(2) Air remaining state:

The completed or finished tire was disassembled, and the presence or absence of remaining air was visually checked. Table 1 (PS3568) Conventional Example Present Example Charging internal pressure P2 (Kpa) of raw tire base body 140 80 Charging internal pressure P1 (Kpa) of rubber tube body - 50 Pressing force P3 (Kpa) of disk 140 - Pasting operation time (second) 10 5 Uniformity · RFV 100 87 · LFV 100 44 Air remaining state 0 0
Table 2 (PS3568) Rubber tube body · Rubber thickness (mm) 1.5 · Cross section diameter d (mm) 62 (radio d/TW) 85% · Inner diameter D1 (mm) 505 (radio D1/D2) 103% · Distance L2 (mm) 5 Guide tool · Inclination angle &agr;1 (°) 55 · Inclination angle &agr;2 (°) 45 · Distance L1 (mm) 5 * Tread width TW is 146 mm.

Outer diameter D2 of tread ring is 488 m.

As described above, since the present invention has both the transfer function of the tread ring and the stitcher function, the installation space can effectively be utilized, and the transfer operation and the pasting operation of the tread ring can be carried out at the same time. Therefore, the step cycle time can largely be reduced. It is unnecessary to pay much attention to misalignment, eccentricity and uneven expansion of the rubber tube, the pasting operation between the tread ring and the raw tire base body can be carried out precisely with high quality without requiring high precision of parts of the rubber tube body itself and high assembling precision. It is possible to prevent air from remaining in the entire region under the tread ring.


Anspruch[de]
Rohreifen-Aufbauvornchtung (1), bei der eine Position eines Laufflächenringes (A) mit einer Gürtellage (a1) und einem Laufflächengummi (a2) mit einem Außenumfang eines Rohreifengrundkörpers (B) auf einer Aufbautrommel (3) ausgerichtet ist, in der Reifenelemente, die eine Karkasslage (b1) umfassen, kombiniert werden, der Rohreifengrundkörper (B) von seiner zylindrischen Form in seine torische Form aufgeweitet wird und der Laufflächenring (A) gegen den torischen Rohreifengrundkörper (B) gedrückt wird, wobei die Rohreifen-Aufbauvorrichtung (1) ein Klebemittel (6) zum Kleben einer inneren Umfangsfläche des Laufflächenringes (A) auf den Rohreifengrundkörper (B) umfasst, wobei

das Klebemittel (6) einen ringartigen Grundkörper (5) umfasst, der sich konzentrisch und relativ mit der Aufbautrommel (3) in einer axialen Richtung des Reifens bewegt, wobei

der ringartige Grundkörper (5) ein Greifwerkzeug (11) mit einer Vielzahl von Segmenten (13), die in der Lage sind, in einer radialen Richtung vorzurücken und sich in dieser zurückzuziehen, wobei die Segmente (13) in der Lage sind, gegen eine äußere Umfangsfläche des Laufflächenringes (A) anzuliegen, um den Laufflächenring (A) zu ergreifen, indem sie von einer Innenfläche des ringartigen Grundkörpers (5) nach innen vorrücken, und

ein nach unten drückendes Klebewerkzeug (12) mit kreisringförmigen Gummischlauchkörpern (15) umfasst, die sich in der Umfangsrichtung des Reifens erstrecken und die auf jeder Seite des Greifwerkzeuges (11) angeordnet sind, wobei die Gummischlauchkörper (15) in der Lage sind, sich aufzuweiten, um Schulterseitenabschnitte (As) des Laufflächenringes (A) nach unten zu drücken und dadurch die Schulterseitenabschnitte (As) an den torischen Rohreifengrundkörper (B) zu kleben, wobei Mittel vorgesehen sind, um die Gummischlauchkörper (15) aufzuweiten, indem ein Innendruck beaufschlagt wird,

dadurch gekennzeichnet, dass

jeder der kreisringförmigen Gummischlauchkörper (15) mit einem Spiel an dem ringartigen Grundkörper (5) befestigt ist, um so in der Lage zu sein, in Position auszulenken, und dass jeder der kreisringförmigen Gummischlauchkörper (15) einen im Wesentlichen kreisförmigen Querschnitt mit einem Durchmesser (d) von 25 bis 100% der Laufflächenbreite (TW) des Laufflächenringes (A) aufweist, wenn ein Innendruck von 1 atm darauf aufgebracht ist.
Rohreifen-Aufbauvorrichtung (1) nach Anspruch 1, wobei das nach unten drückende Klebewerkzeug (12) ein Führungswerkzeug (16) mit einem inneren Führungsstück (16i) und einem äußeren Führungsstück (16o) aufweist, die sich jeweils in einer Umfangsrichtung innerhalb und außerhalb des Gummischlauchkörpers (15) in der axialen Richtung des Reifens erstrecken und die Ausweitung des Gummischlauchkörpers (15) führen, wobei das innere und das äußere Führungsstück (16i, 160) jeweils in einer Richtung von dem Gummikörper (15) weg von außen nach innen in der radialen Richtung geneigt sind. Rohreifen-Aufbauvorrichtung (1) nach Anspruch 1 oder 2, wobei das innere Führungsstück (16i) einen Neigungswinkel (&agr;1) von 50 bis 90° bezüglich der axialen Richtung des Reifens aufweist, das äußere Führungsstück (16o) einen Neigungswinkel (&agr;2) von 30 bis 70° bezüglich der axialen Richtung des Reifens aufweist und der Neigungswinkel &agr;2 gleich oder kleiner als der Neigungswinkel &agr;1 ist (&agr;2≤&agr;1). Verfahren zum Herstellen eines Rohreifens, das umfasst: einen Greifschritt zum Ergreifen eines Laufflächenringes (A) mit einer Gürtellage (a1) und einem Laufflächengummi (a2) durch ein Greifwerkzeug (11), das eine Vielzahl von Segmenten (13) umfasst und in einem ringartigen Grundkörper (5) vorgesehen ist, der in der Lage ist, sich konzentrisch mit einer Aufbautrommel (3) in der axialen Richtung des Reifens zu bewegen, einen Schritt zum Bilden eines zylindrischen Rohreifengrundkörpers (B) durch Wickeln von Reifenelementen mit einer Karkasslage (b1) auf der Aufbautrommel (3), einen Positionierungsschritt zum Positionieren des ergriffenen Laufflächenringes (A) bezüglich des Rohreifengrundkörpers (B) auf der Aufbautrommel (3) durch eine relative Bewegung zwischen dem ringartigen Grundkörper (5) und der Aufbautrommel (3), einen Aufweitungsschritt zum Drücken und Kleben des Rohreifengrundkörpers (B) an und gegen einen zentralen Abschnitt des ergriffenen Laufflächenringes (A) durch Aufweiten des Rohreifengrundkörpers (B) auf der Aufbautrommel (3) von seiner zylindrischen Form in seine torische Form, indem ein Innendruck auf den zylindrischen Rohreifengrundkörper (B) aufgebracht wird, und einen Klebeschritt zum Kleben der inneren Umfangsfläche des Laufflächenringes (A) an die äußere Umfangsfläche des torischen Rohreifengrundkörpers (B) durch Aufweiten von kreisringförmigen Gummischlauchkörpern (15), die sich in der Umfangsrichtung des Reifens erstrecken und die auf jeder Seite des Greifwerkzeuges (11) angeordnet sind, wodurch Schulterseitenabschnitte (As) des Laufflächenringes (A) nach unten gedrückt werden, um den Laufflächenring (A) an den torischen Rohreifengrundkörper (B) zu kleben, wobei die Aufweitung der kreisringförmigen Gummischlauchkörper (15) durch Aufbringung eines Innendruckes auf die Gummischlauchkörper (15) durchgeführt wird, dadurch gekennzeichnet, dass jeder der kreisringförmigen Gummischlauchkörper (15) mit einem Spiel an dem kreisringförmigen Grundkörper (5) befestigt wird, um so in der Lage zu sein, in Position auszulenken, und dass jeder der kreisringförmigen Gummischlauchkörper (15) einen im Wesentlichen kreisförmigen Querschnitt mit einem Durchmesser (d) von 25 bis 100% der Laufflächenbreite (TW) des Laufflächenringes (A) aufweist, wenn ein Innendruck von 1 atm darauf aufgebracht wird. Verfahren nach Anspruch 4, wobei sich jeder der Gummischlauchkörper (15) aufweitet, während er durch ein inneres Führungsstück (16i) und ein äußeres Führungsstück (16o) geführt wird, die sich in der Umfangsrichtung des Reifens axial innerhalb und außerhalb eines jeden Gummischlauchkörpers (15) erstrecken. Verfahren nach Anspruch 4 oder 5, wobei der Innendruck der Gummischlauchkörper (15) 20 bis 95% des Innendruckes des Rohreifengrundkörpers (B) beträgt. Verfahren nach einem der Ansprüche 4 bis 6, wobei der Abstand in der axialen Richtung des Reifens zwischen der Mitte des im Wesentlichen kreisförmigen Querschnittes eines jeden Gummischlauchkörpers (15) und dem axial äußeren Ende der breitesten Gürtellage (a1) -5 bis +10 mm beträgt. Verfahren nach Anspruch 5, wobei das innere und äußere Führungsstück (16i, 16o) derart angeordnet werden, dass sie im Querschnitt eine V-Form bilden, sodass der Abstand zwischen ihnen radial nach innen zunimmt, wodurch eine Ausweitung eines jeden Gummischlauchkörpers (15) in der axialen Richtung nach innen und nach außen begrenzt ist. Verfahren nach Anspruch 8, wobei der Neigungswinkel (a2) des äußeren Führungsstückes (160) zu der axialen Richtung kleiner ist als der Neigungswinkel (a1) des inneren Führungsstückes (16i) zu der axialen Richtung. Verfahren nach einem der Ansprüche 4 bis 9, wobei jeder der kreisringförmigen Gummischlauchkörper (15) von dem ringartigen Grundkörper (5) mit einem Spiel gestützt wird, sodass er in der Lage ist, durch ein Luftventil umfassende Befestigungselemente in Position auszulenken.
Anspruch[en]
A raw tire forming apparatus (1) in which a position of a tread ring (A) including a belt ply (a1 and a tread rubber (a2) is aligned with an outer periphery of a raw tire base body (B) on a former (3) in which tire members including a carcass ply (b1) are combined, the raw tire base body (B) is expanded from its cylindrical shape to its toroidal shape, and the tread ring (A) is pushed against the toroidal raw tire base body (B), the raw tire forming apparatus (1) including pasting means (6) for pasting an inner peripheral surface of the tread ring (A) to the raw tire base body (B), wherein

the pasting means (6) includes a ring-like base body (5) which moves concentrically and relatively with the former (3) in an axial direction of the tire,

the ring-like base body (5) includes a grasping tool (11) having a plurality of segments (13) capable of advancing and retracting in a radial direction, the segments (13) capable of abutting against an outer peripheral surface of the tread ring (A) to grasp the tread ring (A) by advancing inward of an inner surface of the ring-like base body (5), and

a pushing-down pasting tool (12) having annular rubber tube bodies (15) extending in the circumferential direction of the tire which are disposed on each side of the grasping tool (11), said rubber tube bodies_(15) being capable of expanding to push down shoulder side portions (As) of the tread ring (A), thereby pasting the shoulder side portions (As) on the toroidal raw tire base body (B), whereby means are provided for expanding said rubber tube bodies (15) by charging an internal pressure, characterized in that each of the annular rubber tube bodies (15) is attached to the ring-like base body (5) with play so as to be able to deviate in position, and in that each of the annular rubber tube bodies (15) has a substantially circular cross section having a diameter (d) of 25 to 100% of the tread width (TW) of the tread ring (A) when an inner pressure of 1 atm is applied thereto.
The raw tire forming apparatus (1) according to claim 1, wherein the pushing-down pasting tool (12) includes a guide tool (16) having an inner guide piece (16i) and an outer guide piece (16o) each of which extends in a circumferential direction inside and outside of the rubber tube body (15) in the axial direction of the tire and guides the expansion of the rubber tube body (15), each of the inner and outer guide piece (16i, 16o) is inclined in a direction away from the rubber body (15) from outer side toward inner side in the radial direction. The raw tire forming apparatus according to claim 1 or 2, wherein the inner guide piece (16i) has an inclination angle &agr;1 of 50 to 90° with respect to the axial direction of the tire, the outer guide piece (16o) has an inclination angle &agr;2 of 30 to 70° with respect to the axial direction of the tire, and the inclination angle &agr;2 is equal to or smaller than the inclination angle &agr;1 (&agr;2≤&agr;1). A method for producing a raw tire comprising: a grasping step for grasping a tread ring (A) including a belt ply (a1) and a tread rubber (a2) by a grasping tool (11) comprising a plurality of segments (13) and provided in a ring-like base body (5) which is able to move concentrically with a former (3) in the axial direction of the tire, a step for forming a cylindrical raw tire base body (B) by winding tire members including a carcass ply (b1) on the former (3), a positioning step for positioning the grasped tread ring (A) with respect to the raw tire base body (B) on the former (3) by relative movement between the ring-like base body (5) and the former (3), an expanding step for pushing and pasting the raw tire base body (B) to and against a central portion of the grasped tread ring (A) by expanding the raw tire base body (B) on the former (3) from its cylindrical shape into its toroidal shape by applying an internal pressure to the cylindrical raw tire base body (B), and a pasting step for pasting the inner peripheral surface of the tread ring (A) to the outer peripheral surface of the toroidal raw tire base body (B) by expanding annular rubber tube bodies (15) extending in the circumferential direction of the tire which are disposed on each side of the grasping tool (11), thereby pushing down shoulder side portions (As) of the tread ring (A) so as to paste the tread ring (A) to the toroidal raw tire base body (B), whereby, the expansion of the annular rubber tube bodies (15) is performed by application of an internal pressure to the rubber tube bodies (15), characterized in that each of the annular rubber tube bodies (15) is attached to the annular base body (5) with play so as to be able to deviate in position, and in that each of the annular rubber tube bodies (15) has a substantially circular cross section having a diameter (d) of 25 to 100% of the tread width (TW) of the tread ring (A) when an inner pressure of 1 atm is applied thereto. The method according to claim 4, wherein each of the rubber tube bodies (15) expands while being guided by an inner guide piece (16i) and an outer guide piece (16o) which extend in the circumferential direction of the tire at axially inside and outside of each of the rubber tube bodies (15). The method according to claim 4 or 5, wherein the internal pressure of the rubber tube bodies (15) is 20 to 95% of the internal pressure of the raw tire base body (B). The method according to any one of claims 4 to 6, wherein the distance in the axial direction of the tire between the center of the substantially circular cross section of each rubber tube body (15) and the axially outer end of the widest belt ply (a1) is from -5 to +10 mm. The method according to claim 5, wherein the inner and outer guide pieces (16i, 16o) are disposed to form a V-shape in cross section such that the distance between them increases toward the radially inward, thereby limiting expansion of each rubber tube body (15) in the axially inward and outward directions. The method according to claim 8, wherein the inclination angle (&agr;2) of the outer guide piece (16o) to the axial direction is smaller than the inclination angle (&agr;1) of the inner guide piece (16i) to the axial direction. The method according to any one of claims 4 to 9, wherein each of the annular rubber tube bodies (15) is supported by the ring-like base body (5) with play so as to be able to deviate in position through mounting hardware including an air valve.
Anspruch[fr]
Appareil pour former un bandage cru (1) dans lequel une position d'un anneau de bande de roulement (A) comprenant un pli de ceinture (a1) et un caoutchouc de bande de roulement (a2) est alignée avec une périphérie externe d'un corps de base de bandage cru (B) sur un formeur (3) dans lequel des éléments de bandage comprenant un pli de carcasse (b1) sont combinés, le corps de base de bandage cru (B) est dilaté de sa forme cylindrique à sa forme toroïdale, et l'anneau de bande de roulement (A) est poussé contre le corps de base de bandage cru toroïdal (B), l'appareil pour former le bandage cru (1) comprenant des moyens de collage (6) pour coller une surface périphérique interne de l'anneau de bande de roulement (A) sur le corps de base de bandage cru (B), dans lequel: les moyens de collage (6) comprennent un corps de base en forme d'anneau (5) qui se déplace de manière concentrique et relative avec le formeur (3) dans une direction axiale du bandage, le corps de base en forme d'anneau (5) comprend un outil de préhension (11) ayant une pluralité de segments (13) capable de faire avancer et de rétracter dans une direction radiale, les segments (13) capables de venir en butée contre une surface périphérique externe de l'anneau de bande de roulement (A) pour saisir l'anneau de bande de roulement (A) en faisant avancer vers l'intérieur une surface interne du corps de base en forme d'anneau (5), et un outil de collage à pousser vers le bas (12) ayant des corps de tube de caoutchouc annulaire (15) s'étendant dans la direction circonférentielle du bandage qui sont disposés de chaque côté de l'outil de préhension (11), lesdits corps de tube en caoutchouc (15) étant capables de se dilater pour pousser vers le bas les parties latérales d'épaulement (As) de l'anneau de bande de roulement (A), collant ainsi les parties latérales d'épaulement (As) sur le corps de base du bandage cru toroïdal (B), moyennant quoi on prévoit des moyens pour dilater lesdits corps de tube en caoutchouc (15) en chargeant une pression interne caractérisé en ce que chacun des corps de tube en caoutchouc annulaire (15), est fixé sur le corps de base en forme d'anneau (5) avec du jeu afin de pouvoir dévier du point de vue de la position, et en ce que chacun des corps de tube en caoutchouc annulaire (15) a une section transversale sensiblement circulaire ayant un diamètre (d) représentant de 25 à 100 % de la largeur de bande de roulement (TW) de l'anneau de bande de roulement (A) lorsqu'une pression interne de 1 atm y est appliquée. Appareil pour former un bandage cru (1) selon la revendication 1, dans lequel l'outil de collage à pousser vers le bas (12) comprend un outil de guidage (16) ayant une pièce de guidage interne (16i) et une pièce de guidage externe (160) dont chacune s'étend dans une direction circonférentielle à l'intérieur et à l'extérieur du corps de tube en caoutchouc (15) dans la direction axiale du bandage et guide la dilatation du corps de tube en caoutchouc (15), chacune des pièces de guidage interne et externe (16i,16o) est inclinée dans une direction à distance du corps en caoutchouc (15) du côté externe vers le côté interne dans la direction radiale. Appareil pour former un bandage cru selon la revendication 1 ou 2, dans lequel la pièce de guidage interne (16i) a un angle d'inclinaison (&agr;1) de 50 à 90° par rapport à la direction axiale du bandage, la pièce de guidage externe (160) a un angle d'inclinaison (&agr;2) de 30 à 70° par rapport à la direction axiale du bandage, et l'angle d'inclinaison est égal ou inférieur à l'angle d'inclinaison &agr;1 (&agr;2 ≤ &agr;1). Procédé pour produire un bandage cru comprenant : une étape de préhension pour saisir un anneau de bande de roulement (A) comprenant un pli de ceinture (a1) et un caoutchouc de bande de roulement (a2) par un outil de préhension (11) comprenant une pluralité de segments (13) et prévu dans un corps de base en forme d'anneau (5) qui peut se déplacer de manière concentrique avec un formeur (3) dans la direction axiale du bandage, une étape pour former un corps de base de bandage cru cylindrique (B) en enroulant les éléments de bandage comprenant un pli de carcasse (b1) sur le formeur (3), une étape de positionnement pour positionner l'anneau de bande de roulement saisi (A) par rapport au corps de base de bandage cru (B) sur le formeur (3) par le mouvement relatif entre le corps de base en forme d'anneau (5) et le formeur (3), une étape de dilatation pour pousser et coller le corps de base de bandage cru (B) sur et contre une partie centrale de l'anneau de bande de roulement saisi (A) en dilatant le corps de base de bandage cru (B) sur le formeur (3) de sa forme cylindrique à sa forme toroïdale en appliquant une pression interne sur le corps de base de bandage cru cylindrique (B), et une étape de collage pour coller la surface périphérique interne de l'anneau de bande de roulement (A) sur la surface périphérique externe du corps de base de bandage cru toroïdal (B) en dilatant les corps de tube en caoutchouc annulaire (15) s'étendant dans la direction circonférentielle du bandage qui sont disposés de chaque côté de l'outil de préhension (11), poussant ainsi vers le bas les parties latérales d'épaulement (As) de l'anneau de bande de roulement (A) afin de coller l'anneau de bande de roulement (A) sur le corps de base de bandage cru toroïdal (B), moyennant quoi la dilatation des corps de tube en caoutchouc annulaire (15) est réalisée en appliquant une pression interne sur les corps de tube en caoutchouc (15), caractérisé en ce que chacun des corps de tube en caoutchouc annulaire (15) est fixé sur le corps de base annulaire (5) avec du jeu pour pouvoir dévier du point de vue de la position, et en ce que chacun des corps de tube en caoutchouc annulaire (15) a une section transversale sensiblement annulaire ayant un diamètre (d) représentant de 25 à 100 % de la largeur de bande de roulement (TW) de l'anneau de bande de roulement (A) lorsqu'une pression interne de 1 atm y est appliquée. Procédé selon la revendication 4, dans lequel chacun des corps de tube en caoutchouc (15) se dilate tout en étant guidé par une pièce de guidage interne (16i) et une pièce de guidage externe (16o) qui s'étendent dans la direction circonférentielle du bandage axialement à l'intérieur et à l'extérieur de chaque corps de tube en caoutchouc (15). Procédé selon la revendication 4 ou 5, dans lequel la pression interne des corps de tube en caoutchouc (15) est de 20 à 95 % de la pression interne du corps de base de bandage cru (B). Procédé selon l'une quelconque des revendications 4 à 6, dans lequel la distance dans la direction axiale du bandage entre le centre de la section transversale sensiblement circulaire de chaque corps de tube en caoutchouc (15) et l'extrémité axialement externe du plus large pli de ceinture (a1) est de l'ordre de -5 à +10 mm. Procédé selon la revendication 5, dans lequel les pièces de guidage interne et externe (16i, 16o) sont disposées pour former une section transversale en forme de V de sorte que la distance entre elles radialement vers l'intérieur, limitant ainsi la dilatation de chaque corps de tube en caoutchouc (15) dans les directions axialement vers l'intérieur et vers l'extérieur. Procédé selon la revendication 8, dans lequel l'angle d'inclinaison (&agr;2) de la pièce de guidage externe (16o) par rapport à la direction axiale est inférieur à l'angle d'inclinaison (&agr;1) de la pièce de guidage interne (16i) par rapport à la direction axiale. Procédé selon l'une quelconque des revendications 4 à 9, dans lequel chacun des corps de tube en caoutchouc annulaire (15) est supporté par le corps de base en forme d'anneau (5) avec du jeu pour pouvoir dévier du point de vue de la position par le biais du matériel de montage comprenant une soupape pneumatique.






IPC
A Täglicher Lebensbedarf
B Arbeitsverfahren; Transportieren
C Chemie; Hüttenwesen
D Textilien; Papier
E Bauwesen; Erdbohren; Bergbau
F Maschinenbau; Beleuchtung; Heizung; Waffen; Sprengen
G Physik
H Elektrotechnik

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