DE102004010288B4 - Vulcanizing mold for molding a vehicle tire with treads, shoulders and sidewalls - Google Patents

Abstract

Vulcanizing mold (10) for molding the tread (2), the shoulders (3) and side walls (4) of vehicle tires, with a plurality of outer, radially movable holders (12) in which mold segments (14) are mounted, the Holders (12) are held together by a surrounding, essentially ring-shaped structure in the form of an outer ring (16) with a sliding surface (18) facing the shaped segments (14), hook elements (24) connected to each holder (12) in each case an undercut groove (20) embedded in the sliding surface (18) engages, so that when the ring (16) is moved axially, a radial movement of the mold segments (14) is effected, with at least one contact surface of a hook element (24) on each groove wall surface (22) comes to rest, with the form segments (14) each abut on side wall shells (28), (30) in the collapsed state, a lower side wall shell (28) being arranged on a base plate (26), and with a upper side wall shell (30) is arranged on a container upper part (32), characterized in that at least ...

Description

The invention relates to a Vulkanisierform for molding a vehicle tire with treads, shoulders and side walls according to the preamble of patent claim 1.

Such, for example from the EP 0 984 852 B1 known forms, especially in the tire industry professional language referred to as a container. Embodiments with a fixed inner core are known, as well as embodiments in which an inflatable toroidal rubber hose presses the green tire against the vulcanization mold from the inside during the vulcanization process. By moving the mold segments against the internal pressure cohesive ring in the axial direction, the mold segments are moved radially outward and so the mold after completion of the molding process or the Vulkanisationsvorganges, during which the tire tread and the design elements of the side wall are created opened.

The formation of the heated tire follows in the known devices by simultaneous radial extraction of all profile segments, which are referred to as mold segments, in one step, since all profile segments move evenly outward in axial process of the retaining ring.

To form or to create design elements in the side walls so-called side shells are used, in which usually design and inscription elements are engraved. Usually, there are two side shells for each shape, namely a lower side shell, which is firmly installed in the container, and an upper side shell, which is inserted into a container shell, which closes the container bin after closing the mold segments upwards.

Such containers have been proven in the tire industry for some time. However, between the mold segments and the side shells so far a certain game of about 1-10 mm, the design could not be compensated so far. However, this was acceptable because there was a more or less clear separation in the design of sidewall ornamentation and the design elements in the shoulder region of the tire created by the molding segments so that any offset in the circumferential direction of the sidewall region to the shoulder region did not occur did not matter.

However, there is an increasing desire to continue ornaments of the shoulder area into the sidewall area. Here, by the play of the side wall shells to the mold segments, it may lead to the unacceptable state that there is visible interference within an ornament.

This problem is solved by the invention in a surprisingly simple way by a vulcanization mold having the features of claim 1. The inventors have recognized that in order to ensure perfect functioning of the mold on the one hand and the consistently good quality of interlocking shoulder / side wall design on the other hand, it is sufficient if at least one mold segment and the side shells a centering component is assigned, which ensures a backlash-free interaction of these components ,

In practical embodiments of the invention can be provided that in each mold segment, a groove is milled, in which engages a sliding block, which is connected to the side wall shell. It is also possible to attach the sliding block to the mold segment and to provide the side wall shells with corresponding grooves into which slide the sliding blocks of the mold segments when closing the mold.

Likewise, it is provided in further embodiments of the invention to design the sliding blocks conical, so that they then thread easily into the groove and the respective associated functional part, so either form segment or side wall shell, automatically center.

Further advantages and embodiments of the invention will be explained with reference to an embodiment in the following description, the claims and with reference to a drawing.

The drawing shows:

1 a partial side view of a created with a Vulkanisationsform invention vehicle tire,

2 a half-radial section through a device according to the invention, and

3 a partial perspective view of a device according to the invention.

1 shows a partial side view of a vehicle tire produced with a Vulkanisierform invention 1 , This one has a tread 2 , a shoulder area 3 and a side wall 4 on. With 5 is a dividing line between shoulder area 3 and sidewall 4 denotes the dividing line 5 conventionally also the dividing line for design elements, of which only hatching, for example 6 and labeling elements 7 are indicated. As an additional design element is here in the side wall still a trapezoid 8th represented, its edges 8a a continuation in a trapezoidal design element 9 of the shoulder area 3 Find.

In this way, the optical image of a gear is created, the teeth partially in the shoulder area 2 , and partially in the shoulder area 3 , and partly in the sidewall area 4 Find.

If there were a clearance between the mold segments and the sidewall shells, then the sidewall area would be 4 opposite the shoulder area 3 offset in the circumferential direction by a few millimeters, so that the visual impression of the gear would not adjust and it would come to disturbing breaks of the design elements.

2 shows a vulcanization mold 10 , which is rotationally symmetrical to a central axis. Several radially distributed holders 12 in which shape segments 14 are stored by an outer ring 16 held together. The outer ring 16 has a conical inner surface 18 on, in the circumferentially distributed for each holder 12 a groove 20 incorporated is the groove 20 has a T-shaped cross-section. The T-shaped cross sections form an undercut groove. In the area of the undercuts are groove wall surfaces 22 educated. In every T-shaped groove 20 slides a hook element 24 , by means of two screws, not shown, with the respective holder 12 connected is. Each hook element 24 has two contact surfaces.

Will the outer ring 16 in the axial direction, ie, moved parallel to the central axis, so come the contact surfaces of the hook elements 24 at the groove wall surfaces 22 to the plant. Each hook element 24 slips due to the angle of attack on an inclined plane, causing the mold segments 14 be pulled outward to open the mold. At the in 2 embodiment shown so slides the holder 12 with the mold segment 14 when opening to the left, while closing the container along a base plate 26 slides to the right.

On the base plate 26 is a lower sidewall shell 28 arranged. In the closed state of the vulcanization mold 10 is just above the lower sidewall shell 28 an upper sidewall shell 30 arranged. The upper side wall shell 30 is on an only schematically indicated container upper part 32 attached, in such a way that slight play in the circumferential direction between the upper side wall shell 30 and container shell 32 consists. The container shell is also referred to as "cone ring" in technical terms.

To the game between the side wall shells 28 . 30 and the shape segments 14 to level, are centering components 34 . 36 with the sidewall shells 28 . 30 connected.

In 3 is a perspective view of a detail of the vulcanization mold 10 with upper side wall shell 30 shown. In the sidewall shell 30 is a groove 38 milled into which a sliding block 40 used and with the side shell 30 is attached. The mold segment is with guide stones 42 Mistake. slide 40 and guide stones 42 are each chamfered at their front edges, so that when passing on the mold segment 14 on the sidewall shell 30 the sliding block 40 easy between the guide stones 42 can slide, causing the mold segment 14 in terms of the side shell 30 is centered.

But there are correspondingly other structural measures are conceivable in which the sliding block inserted deeper into the side wall shell and the mold segment 14 is provided with a corresponding groove into which the sliding block can slide, so that on the guide stones 42 could be waived.

LIST OF REFERENCE NUMBERS

1

vehicle tires

2

tread

3

shoulders

4

Side wall

5

parting line

6

hatching

7

heading element

8th

trapeze

8a

edge

9

trapeze

10

vulcanization mold

12

holder

14

mold segment

16

outer ring

18

conical sliding surface

20

groove

22

groove wall

24

hook element

26

baseplate

28

lower side wall shell

30

upper side wall shell

32

Container shell

34, 36

each centering components

38

groove

40

slide

42

leadership stone

Claims (5)

Vulcanizing mold ( 10 ) for shaping the tread ( 2 ), shoulders ( 3 ) and sidewalls ( 4 ) of vehicle tires, with a plurality of outer, radially movable holders ( 12 ), in which shape segments ( 14 ), the holders ( 12 ) of a surrounding, substantially annular structure in the form of an outer ring ( 16 ) with one of the mold segments ( 14 ) facing sliding surface ( 18 ) are held together, each with a holder ( 12 ) connected hook elements ( 24 ) in each case an undercut, in the sliding surface ( 18 ) recessed groove ( 20 ), so that in the axial process of the ring ( 16 ) a radial movement of the mold segments ( 14 ) is effected, wherein at least one contact surface of a hook element ( 24 ) on a groove wall surface ( 22 ) comes to rest, wherein in the contracted state, the mold segments ( 14 ) each on side wall shells ( 28 ) 30 ), wherein a lower side wall shell ( 28 ) on a base plate ( 26 ), and wherein an upper side wall shell ( 30 ) on a container shell ( 32 ), characterized in that at least one mold segment ( 14 ) at least one centering component ( 34 ; 36 ) on at least one sidewall shell ( 28 ; 30 ) for preventing an offset between the sidewall shell ( 28 ; 30 ) and the at least one mold segment ( 14 ) is assigned in the circumferential direction, by which a perfect fit connecting the mold segment ( 14 ) with the sidewall shell ( 28 ; 30 ) takes place at a defined position. Vulcanizing mold according to claim 1, characterized in that the centering component ( 34 ; 36 ) as a sliding block ( 40 ) is trained. Vulkanisierform according to claim 1 or 2, characterized in that in the mold segment ( 14 ) and / or the sidewall shell ( 28 . 30 ) a groove ( 38 ), in which the centering component ( 34 . 36 ) can be used. Vulcanizing mold according to at least one of claims 1 to 3, characterized in that the centering component ( 34 . 36 ) fixed to the sidewall shell ( 28 . 30 ) connected is. Vulcanizing mold according to at least one of the preceding claims, characterized in that guide stones ( 42 ) with the mold segment ( 14 ) and / or the sidewall shell ( 28 . 30 ), which the centering component ( 34 . 36 ) in the closed state of the vulcanization mold ( 10 ) without play.

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