SU554661A1 - Method of assembling pneumatic tyres - Google Patents

Abstract

A METHOD FOR ASSEMBLY OF PNEUMATIC PAINTING PACKETS, consisting in placing the cord layers on the main and auxiliary assembly drums, forming a skeleton bracelet, stretching it in the radial direction by unfolding the main drum to form the end shoulders to fit the bead rings. wrap the edges of the bracelet on the rings and carry out the subsequent imposition of other elements of the tire, characterized in that, in order to ensure the perpendicular axes of the bracelet of the end face prior to stretching the bracelet in the radial direction on the parts of the bracelet that form the end shoulders to fit the side rings, form compensating transverse corrugations "with f

Description

The invention relates to methods for assembling pokryashek pneumatic tires on expansion drums and is intended for use in the tire industry.

A known method for assembling tires of pneumatic tires, which consists of laying layers of cord on the assembly drum, forms a frame bracelet with a diameter larger than the diameter of the bead rings and with end shoulders to fit the bead rings, form compensating corrugations on the free portions of the frame, and produce j d t fit the side rings, wrap the edges of the bracelet on the rings and then overlap the other elements of the tire.

The compensation corrugations are formed in the longitudinal direction in order to reduce the diameter of the cord i of the bracelet by the amount necessary for the side rings to pass over the bracelet to the places of their landing and during their passage they should not touch the outer surface of the bracelet.

However, folds are formed in the bead area and the post length of the cord threads between the bead rings and the cord is not secured.

Another method of assembling pokryshkas of pneumatic tires is known, which is that the main and auxiliary assembly drums are applied with layers of cord, form a skeleton bracelet, stretch it in the radial direction by unclamping the main drum with the formation of end shoulders before fitting the bead rings, install the bead

the rings, fix them, wrap the edges of the bracelet on the rings, and the subsequent imposition of other elements of the squalls is accomplished.

The last of the above methods is closer to the one proposed.

When assembling according to this method, in the process of unclamping the main drum, the correct tlrtsovy surfaces, i.e. surfaces perpendicular to the axis of the bracelet, and the cord does not tightly fit the shoulders of the drum, but position it at an acute angle to the axis of the bracelet.

The presence of this angle on the end surface of the bracelet is not constant due to significant fluctuations in the elastic and plastic properties of the rubber cord bracelets, and also depends on the frictional forces between the inner surface of the bracelet and the outer surface of the drum,

In order to provide the bracelet perpendicular axes of the end surfaces of the proposed method, prior to stretching the bracelet in the radial direction, in the parts of the bracelet forming the end shoulders for fitting the bead rings, form compensating transverse corrugations.

Figure 1-6 shows the sequential stages of assembling tires for the proposed method.

On the main drum 1 to the auxiliary drums 2 and 3, having a diameter in the compressed state, is less than the internal diameter of the side ring

The assembled pockets form a frame bracelet 4 of side tapes 5 and layers of rubberized cord, 1). In order for bracelet 4 to fit tightly the drums 1, 2 and 3, they are slightly pre-expanded. They make axial movement of the side parts 7 (edges) bracelet to its center (FIG. 2) by the required values by, for example, axial movement of auxiliary drums 2 and 3 to the center of the main drum G. When you move the side edges 7 on the bracelet 4, form -transverse ring corrugations 8 at the junction of the main drum and auxiliary drums 2 and 3.

The middle part, the bracelet 4 is produced, -zagruzka with the formation on it of the end parts 9 (FIG. 3), which form from annular corrugations 8 that play the role of compensators in the formation of the end parts 9

On the formed ends 9, the side rings 10 are fitted (figure 4), both side edges 7 of the bracelet 4 are unclenched and wrapped around the rings (figure 5). Then lay the layers of the belt I1 and the protector 12 (6), which are pressed or rolled.

The drums, 2 and 3 are compressed, and the collection is removed.

This method of assembling pokryshgek allows you to improve the quality of the pokrysh1ek collected, r-and also eliminate the operation of compressing the edges of the layers of the cord on the drum shoulders, which simplifies the process of assembling pokrysh1ek.

FIG. g

7 9

97

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Par.4

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Phage. five

0kg. 6

Claims (1)

METHOD OF ASSEMBLY OF TIRES OF PNEUMATIC TIRES, which consists in the fact that cord layers are laid on the main and auxiliary assembly drums to form a carcass