SU671156A1 - Pneumatic tyre assembly drum - Google Patents

Description

The invention relates to the manufacture of tires and is intended for assembly of a tire on a drum, the shape of which approximately corresponds to the shape of the tire.

A known drum for assembling a tire of a pneumatic tire containing sectors with radially movable shoulders connected with power cylinders installed in the cavity formed by the sectors [1] ·

The movement of the shoulders in the known drum is provided by the arrangement of the guides for them inclined relative to the longitudinal axis. The increase in the coefficient of folding sectors in the known drum is limited due to the placement between the shaft and sectors of the power cylinders.

Also known is a drum containing sectors with fixed levers [2].

The increase in the shoulders, rigidly on the rotary curly folding coefficient in a known drum, leads to an increase in its dimensions.

Known drum containing sectors with movable shoulders from the lever-screw mechanism [3}. Due to j.

the mobility of the shoulders during the course of the process ~ ~ - the entire process of folding the sectors increases the load on the elements of this mechanism of the tire sides. Closest to the described one is a drum for assembling a tire of a pneumatic tire, comprising a horizontally disposed shaft, alternating sectors radially movable relative to the shaft with shoulders movably and motionlessly mounted on their ends, a mechanism of radial reciprocating movement of sectors having pairwise mounted and articulated with them and with sectors levers, th mechanism of longitudinal reciprocating movement of the shoulders, having mounted on connected 20 · _with At the ends of the levers are gears interacting with gear racks mounted along sectors with movable shoulders and connected to the latter [4].

With an increase in the length of sectors for assembling a large tire with an increased width of the chassis and providing the required coefficient of folding sectors decreases hard- | bone sectors due to need;

‘4 increases the center distance of the gears.

The purpose of the invention is the ability to assemble a large tire with an increased width of the chassis due to increased stiffness of the sectors during ^{1 of} their radial movement.

This goal is achieved by the fact that the radial reciprocating mechanism. sector movements is equipped with rack and pinion gears, gear racks in which are made with end working inner and peripheral sections relative to the shaft and movably mounted on sectors parallel to the existing ones, and gear gears are mounted on the ends of levers connected with sectors,

The gear racks of the mechanism of radial movement of sectors, installed along the latter, are stiffeners, due to their length and connection at their ends with pivoting levers, ensuring uniform load distribution and stability.

Figure 1 shows the described drum, a longitudinal section; in the working position during assembly; figure 2 is the same when folding sectors.

The drum for assembling a tire of a pneumatic tire comprises a horizontally mounted hollow shaft 1 and alternating sectors 2 with shoulders 3 movably mounted on their ends and sectors 4 with fixed shoulders 5. Sectors 2 and 4 are connected to the drive for their radial movement by a screw 6 concentrically mounted with a hollow shaft 1, interacting with a screw nuts 7, on which the sliders 8 are mounted, on which the sliders 9 are movably mounted. On the sliders 8 and 9, the hinges are pairwise along wad 1 mounted but equal length and having the same inclination angles levers 10 with toothed gears 11 and 12 at the ends of which interact with the internal and, respectively, peripheral 5.uchastkami, gear racks 13 which are movably mounted in longitudinal guides 14.

The mechanism of the longitudinal reciprocating movement of the shoulders 3 relative to the sectors! 2 comprises gears 15 coaxially mounted with gears 11 and 12, and gear racks 16.

The work of the drum is carried out as follows.

The shaft 1 is attached to the shaft 17 of the machine and the screw 6 is connected to the shaft 18 of the machine.

After tire assembly, sectors are folded. For this, the rotating shaft 17 is braked, the shaft 18 and the screw 6 rotate and the sliders 8 are moved from the center to the opposite ends of sectors 2 and 4. At the same time, the levers 10 are rotated relative to the gears 11 and 12, also in opposite directions. Since the diameters of the gears 12 and 11 are the same and one of them, the gear 12 is engaged with the peripheral section S while moving along the sector of the gear rack 13, and the other gear 11 is with the inner section <3, the angles of rotation of the levers 10 are the same, which provides stability of sectors during their radial movement.

The implementation of the mechanism of folding sectors in the described manner increases the stiffness of the sectors when assembling large tires.

Claims (4)

increasing the center-to-center distance of the gears. The purpose of the invention is to provide the possibility of assembling a large-sized tire with an increased ash part of the running part due to an increase in hard sectors during their radial movement. The goal is achieved by the fact that the mechanism of radial reciprocating movement of sectors is equipped with gear-rack drives, the gear racks in which are made with terminal internal and peripheral parts of the shaft and are movably mounted on sectors parallel with, and gears are mounted on connected with sectors of the ends of the levers, the racks of the mechanism for the radial movement of the sectors installed along the latter are stiffening elements, thanks to their lsennosti and communications on their ends with pivoting levers is ensured uniformity of load distribution and stability, Figure 1 is described by the drum, longitudinal section in the operating position in the assembly; Figure 2 is the same when folding sectors. The drum for assembling a tire of a pneumatic tire contains a horizontally mounted hollow shaft 1 and alternating sectors 2 with its shoulders 3 forming the working surface, with shoulders 3 movably mounted on their ends, and sectors 4 with fixed shoulders 5. Sectors 2 and 4 are connected with a drive for radial movement through screw 6, concentrically mounted with a hollow shaft 1, interacting with screw nuts 7, on which sliders 8 are mounted, on which sliders 9 are movably mounted. On sliders 8. and 9 are pairwise along shaft 1 ball Equally mounted are equal in length and having identical tilt angles levers 10 with gear gears I and 12 at the ends interacting respectively with internal a, peripheral 5. segments, gear racks 13, which are movably mounted in the longitudinal direction 14. The longitudinal mechanism the reciprocating movement of the shoulders 3 relative to the sectors 2 comprises toothed gears 15, coaxially mounted with gears 11 and 12, and toothed racks 16. The operation of the drum is carried out as follows. The shaft 1 is attached to the shaft 17 of the machine and the screw 6 is connected to the shaft 18 of the machine. After the tire is assembled, the sectors are folded. For this, the impeller shaft 17 is braked, the shaft 18 and the screw 6 rotate and the slide blocks 8 move from the center to the opposite ends of the sectors 2 and 4. In this case, the levers 10 rotate relative to the gears 11 and 12, also in opposite directions .. Since the diameters gear gears 12 and 11 are the same and one of them gear 12 is in engagement with the peripheral section while moving along the sector of the rack 13, and the other gear 11 with the internal section a, then the angles of rotation of the levers 10 are the same, which ensures stability with radial displacement. The implementation of the folding mechanism of the sectors in the manner described increases the rigidity of the sectors during the assembly of large-sized pockets. DETAILS OF THE INVENTION A drum for assembling a pneumatic tire tire containing a horizontal shaft, radially: moving relative to the shaft alternating sectors with movably and fixedly mounted shoulders on the ends, a radial reciprocating mechanism for moving the sectors, having sliders mounted on the shaft in pairs and hinged associated with them with sector levers, and the mechanism of longitudinal reciprocating movement of shoulders, having mounted on connected sects The ends of the arms of the gears that interact with the toothed racks are installed 1 along the sectors with movable shoulders and connected to the latter, characterized in that, in order to enable the assembly of a large tire with an increased chassis width due to an increase in the rigidity of the sectors during their radial movement, the mechanism of radial reciprocating movement of the sectors is equipped with gear-rack gears, gear racks in which are made with end internal working and peripheral to the shaft sections and movably mounted on sectors parallel to the existing ones, and gears mounted on the sector-related ends of the levers,. Sources of information taken into account in the examination 1. German patent number 1218146,; cl. 39 a 17/16, published 1966. 2. The patent of France 2123642, cl. In 29 N 17/00, published. 1973. 3. Authors testimony of the USSR № 187290, cl. B 29 N 17/16, 1965. 4. USSR author's certificate number 472810, cl. On 29 Nov 17/16, 1973. Fe / yy