WO2010108898A1

WO2010108898A1 - Method for mounting a tire and apparatus for carrying out the method

Info

Publication number: WO2010108898A1
Application number: PCT/EP2010/053730
Authority: WO
Inventors: Georg Lipponer; Werner Lehr; Andreas Peinelt; Matthias Lemser
Original assignee: Schenck Rotec Gmbh
Priority date: 2009-03-25
Filing date: 2010-03-23
Publication date: 2010-09-30
Also published as: DE102009014285A1; DE102009014285B4

Abstract

In a method for mounting a tire (2) having two beads (7, 9) onto a rim (1), the rim (1) is held by a retaining device, the tire (2) is placed on the rim (1) in a predetermined position, a first tool (12) for mounting the first bead (7) adjoining the rim is brought into a working position on the rim flange (6) and moved relative to the rim flange and the tire by a rotational movement about the axis of the rim (1). Once the rotational movement has passed substantially through an angle of 180º, a second tool (13) for mounting the second bead (9) is brought into a working position on the rim flange (6) that is offset by substantially 180º with respect to the current working position of the first tool (12) and moved relative to the rim flange (1) and tire (2) by continuing the rotational movement together with the first tool (12). The first tool (12) is retracted from the working position on the rim flange (6) as soon as the first bead (7) has passed over the rim flange, and the second tool (13) is moved relative to the rim flange (6) and the tire (2) by continuing the rotational movement until the second bead (9) has also passed over the rim flange (6), and thereafter the second tool (13) is retracted from the working position on the rim flange (6).

Description

METHOD FOR ASSEMBLING A TIRE AND DEVICE FOR CARRYING OUT THE PROCESS

The invention relates to a method for mounting a tire with two beads on a rim, wherein the tire is placed in a predetermined position on the rim and the two beads successively by means of tools acting on the beads, which are moved along the edge of the rim, over a rim edge be striped. The invention also relates to a device for carrying out the method with a holding device for holding a rim, a first tool with a tire engagement region, a first guide device, on which the first tool is movably guided and supported, a first drive device through which the first tool in a working position on the rim is movable, and a rotary drive device which is adapted to set the first guide means and the first tool or the holding means of the rim in a rotational movement about the axis of the rim.

A method and a device of the type initially known from EP 1 054 783 B1. In the known method, the rim is first tightened in a tire assembly station and then placed the tire in a predetermined eccentric position on the rim and held with a clamp. A tool for mounting the tire bead, which is disposed on the arm of a robot, is engaged with the tire and guided around the rim in a programmed path to spread the first bead over the edge of the rim. After the tool has traveled approximately 360 ° with respect to the rim, it is engaged with the second bead of the tire and moved along a second programmed path, making a second movement around the entire circumference of the rim around the second Bead to mount on the rim. In the known method, therefore, the assembly tool performs a rotational movement about the rim of two times 360 ° in order to mount the tire beads successively.

In the automatic assembly of tires in automobile production, the time required to assemble a tire is a production-limiting one

Factor. There is therefore an effort to keep this assembly time as small as possible. An acceleration of the assembly process, however, by the with the Mounting speed increasing material load and the corresponding higher risk of damage limits.

Object of the present invention is to provide a method of the type mentioned, which allows a reduction in assembly time without increasing the material load. It is another object of the invention to provide a device suitable for carrying out the method.

According to the invention, said object is achieved by a method having the features specified in claim 1. Advantageous embodiments of the method are specified in claims 2 to 7. With regard to the device, said object is achieved according to the invention by the features specified in claim 8.

The inventive method for mounting a tire with two beads on a rim, wherein the tire is placed in a predetermined position on the rim and the beads are successively striped over a rim edge by means of tools acting on the beads, which are moved along the edge of the rim comprises the steps of bringing a first tool for mounting the first bead adjacent to the rim into a working position on the rim edge and being moved by a rotational movement about the axis of the rim relative to the rim edge and tire, a second tool for mounting the second one Bolt is brought to a rotational angle of rotation of substantially 180 ° in a relation to the current working position of the first tool offset by substantially 180 ° working position on the rim edge and by continuing the rotational movement in the same direction together with the first tool relative to the rim edge and the tires is moved, the first tool is retracted from the working position at the edge of the rim, as soon as the first bead has skipped the rim edge, and the second tool is moved with continued rotation in the same direction of rotation relative to the rim edge and the tire and the second tool from the working position on Rim edge is retracted after the second bead is striped over the edge of the rim. In the method according to the invention, the assembly of the second bead of the tire is not carried out following the assembly of the first bead, but begins much earlier during the assembly of the first bead, and at a time at which the tool for mounting the first bead has passed through a rotation angle of substantially 180 ° along the edge of the rim. Due to the corresponding earlier beginning of the assembly of the second bead and the overlapping of the assembly operations of the first and second bead, the total duration of the tire mounting operation is considerably shorter than in the known and customary procedure. If, in the usual procedure, one full rotation, ie a total of two rotations, is required for each tool, then the method according to the invention is achieved with a half turn less, ie one and a half turns. This equates to a 25% reduction in the time required for the clean assembly process. Since the cycle time for the assembly of a tire, in addition to the pure process time, involves further non-productive times, the achievable cycle time reduction is lower, but reaches values of 12% to 15%. Since the time gain of the method according to the invention is not achieved by an increase in the operating speed of the assembly tools, but the operating speed can remain unchanged compared with the known methods, there are no higher loads on the tire, which could adversely affect.

According to a further proposal of the invention can be provided that the second tool after reaching a rotational angle of rotation of substantially 480 ° is withdrawn from the working position. The second tool is thus already withdrawn before it was a full turn in use. As a result, the process time for the assembly process can be further shortened. Furthermore, it can be provided that the first tool is retracted after reaching a rotational angle of the rotational movement of substantially 300 ° from the working position. This angular position has proved to be advantageous for the entire course of the assembly process.

A preferred embodiment of the method according to the invention provides that the

Rotary movement is performed by the two tools and the rim and the

Tires are prevented from rotating. This procedure is advantageous for the automatic and exactly centered clamping of the rim in the - A -

Mounting device and the automatic feeding of the tire. It may further be provided that at the end of the assembly process, i. After retraction of the second tool, both tools are moved by continuing the rotational movement in the same direction or by a rotational movement in the opposite direction of rotation in the starting position for a subsequent assembly operation.

Instead of the two tools, according to another proposal of the invention, the rotational movement can also be performed by the rim and the tire, wherein the two tools are prevented from rotating about the axis of the rim. In this variant, the tools are thus only substantially parallel to the axis of the rim in the working position and moved back from this.

According to the invention, an apparatus for carrying out the method comprises a holding device for holding a rim, a first tool with a

Tire engagement region, a first guide device, on which the first

Tool is movably guided and supported, a first drive device through which the first tool is movable to a working position on the rim, and a

A rotary drive device adapted to translate the first guide means and the first tool or fixture of the rim into a rotational movement about the axis of the rim, a second tool having a

Tire engaging portion, which is movably guided and supported on a second guide means and independent of the first tool by a second

Drive device is movable into the working position on the rim, wherein the two tools are arranged to each other so that their two working positions in

Relative to the axis of the rim diametrically opposite each other.

The invention will be described in more detail with reference to an embodiment shown in the drawing. Show it

Figure 1 shows the basic structure of a device for tire assembly after the

2, the working range of the device according to FIG. 1 at the beginning of the invention. FIG

Assembly process, FIG. 3 a shows the working range of the device according to FIG. 1 after a rotation of the tools through a rotation angle of 180 °, FIG. 3 b shows a polar diagram of the tool movement until it reaches the position

Figure 4a shows the position of the tools after assembly of the first bead,

FIG. 4b is a polar diagram of the tool movement until reaching the

Tool position according to Figure 4a, Figure 5a, the position of the tools of the device according to Figure 1 at

Termination of the tire assembly, Figure 5b is a polar diagram of the tool movement until reaching the

Tool position according to Figure 5a.

FIG. 1 shows a rim 1 and a tire 2 to be wound up on it in an assembly station 3 for automatic tire mounting. The rim 1 is clamped on a receiving table 4 by means of several clamping elements 5. The tire 2 was fed from a feed device, not shown, and placed on the rim 1 so eccentric that it assumes a tilted tilt to the rim 1, wherein a portion of the upper edge rim 6 in the bounded by the lower first bead 7 of the tire 2 opening protrudes.

About the receiving table 4, a rotatable Aufziehkopf 8 is coaxial with the axis of the rim, which is rotatably driven by a rotary drive device, not shown, the assembly station 3. At the Aufziehkopf 8 two guide means 10, 11 are arranged diametrically to the axis. On the guide device 10, a first tool 12 and on the guide device 1 1, a second tool 13 is held and guided parallel to the axis of the rim movable. By means of drive devices 14, 15 which are arranged on the Aufziehkopf 8, the tools 12, 13 in the longitudinal direction of the guide means 10, 11 are moved and detected in defined positions. Both drive devices 14, 15 and the rotary drive device for rotating the wind-up head 8 are independently controllable by a programmable controller. The tools 1 1, 12 are equal to each other and each comprise a bead guide 16 and a pinch roller 17. The arrangement of additional elements, such as a follower roller, may also be provided. In addition, the first tool 12 and the second tool 13 may deviate be designed from each other to allow a better adaptation to each tool 12 and 13 coincident assembly task.

FIG. 1 shows the operating situation of the assembly station 3 before initiation of the actual assembly operation by activation of the wind-up head 8. The tools 12, 13 are in initial position above the tire 2 and the rim 1. The rim 1 is fixed in the assembly station 3. The seating area of the rim 1 and the beads 7, 9 of the tire 2 are wetted with lubricant.

To initiate the tire assembly by driving the drive device 14, the first tool 12, as shown in Figure 2, moved through the opening of the upper bead 9 in the working position at the edge of the rim 1. At the same time, as indicated by the arrows 19, 20, the tool 12 adjacent, located next to the rim 1 edge of the tire 2 by suitable clamping means down and pressed in the direction of the rim 1. Once the tool 12 has reached the position shown in Figure 2, the wind-up head 8 is rotated clockwise about the axis of the rim in rotation. As a result, the tool 12 moves along the edge of the rim 6, with its bead guide 16 continuously brushing the lower bead 7 over the edge of the rim 6 and the pressure roller 17 following the bead guide 16 pressing the bead 7 down towards the middle of the rim.

During the rotation of the Aufziehkopfes 8, the second tool 13 is moved at such a time in the direction of the rim 1 by driving the drive device 15 that it reaches the working position at the edge of the rim 1, if it is after the rotation of the Aufziehkopfes 8 by 180 ° is located at the exit point of the first tool 12. This situation is shown in Figure 3a, with the illustration omitted for the sake of simplicity. In Figure 3b, the paths of the tools 12, 13 are illustrated up to this position by circular arcs. Points here denote the respective starting position and arrows the instantaneous position of the tools 12, 13. Upon reaching its working position, the second tool 13 engages the upper, second bead 9 of the tire 2, whereby this, since the rotational movement of the Aufziehkopfes 8 is not interrupted is also continuously striped over the edge of the rim 6. The assembly of the first, lower bead 7 is completed when the first tool 12 has passed through a rotation angle of substantially 300 °. The tool 12 can therefore be withdrawn by driving the drive device 14 in its remote from the rim 1 basic position. This operating situation is shown in FIG. 4a. FIG. 4b illustrates the angles of rotation which the tools 12, 13 have traveled until reaching this operating position. It is 300 ° for both tools.

FIG. 5 shows the operating position of the tools 12, 13 after a rotation of the wind-up head 8 by 480 °. Upon reaching this position, the second tool 13 has undergone a rotational angle of 300 ° in the working position, so that the mounting of the second bead 9 is completed. By controlling the drive device 15 and the second tool 13 is now retracted to its normal position. The assembled unit of rim 1 and tire 2 is therefore released by loosening the clamping elements 5 and can be conveyed out of the assembly station 3 by means of provided conveyors. The Aufziehkopf 8 is further rotated during unloading and reloading the assembly station 3 with the tools 12, 13 retracted until after reaching a total rotation angle of 720 ° corresponding to two complete revolutions of the initial position shown in Figure 1 of the tools 12, 13 is reached again. In this position, the Aufziehkopf 8 is stopped until the next assembly process can begin.

The described method has the advantage that the working path, which the tools pass together in the working position during a tire assembly, is in the

Compared to the known methods by 180 °, namely shortened from 660 ° to 480 °.

This corresponds to a reduction of the process time, in which tools in

Working position are located on the edge of the rim, from 27% without increasing the

Working speed of the tools. Admittedly, until the starting position for the new assembly process has been reached, the rotational travel to be covered by the wind-up head 8 is the same in the known and the new method.

After retraction of the tools 12, 13, the rotation of the Aufziehkopfes

8 but done with greater speed and unloading the

Mounting device can be started earlier accordingly. Experiments have shown that with the inventive method, a reduction of Takes cycle time for the automatic assembly of tires and rims by 12% to 15% without increasing the process speed.

Claims

A method of assembling a tire with two beads on a rim, wherein the tire is placed in a predetermined position on the rim and the beads are successively striped over a rim edge by means of tools acting on the beads, which are moved along the edge of the rim, characterized in that a first tool (12) for mounting the rim (1) adjacent first bead (7) is brought into a working position on the rim edge (6) and by a rotational movement about the axis of the rim (1) relative to the rim edge

(6) and the tire (2) is moved, after a rotation angle of the rotational movement of substantially 180 °, a second tool (13) for mounting the second bead (9) in relation to the current working position of the first tool (12) in the Moving substantially 180 ° offset working position on the rim edge (6) and is moved by continuing the rotational movement in the same direction together with the first tool (12) relative to the rim (6) and the tire (2), the first tool (12) is withdrawn from the working position at the edge of the rim (6) as soon as the first bead (7) is striped over the edge of the rim, and the second tool (13) continues to rotate in the same direction of rotation relative to the rim edge (6) and the tire (2) is moved, the second tool (13) from the working position at the rim edge (6) is retracted after the second bead (13) is striped over the edge of the rim.

2. The method according to claim 1, characterized in that the second tool (13) is retracted after reaching a rotational angle of the rotational movement of substantially 480 ° from the working position.

3. The method according to any one of the preceding claims, characterized in that the first tool (12) is withdrawn after reaching a rotational angle of the rotational movement of substantially 300 ° from the working position.

4. The method according to any one of the preceding claims, characterized in that the rotational movement about the axis of the rim (1) of the two tools (12, 13) is performed and the rim (1) and the tire (2) prevented from rotating become.

5. The method according to claim 4, characterized in that after retraction of the second tool (13) both tools (12, 13) are moved by continuing the rotational movement in the same direction of rotation to the starting position for a subsequent assembly process.

6. The method according to claim 4, characterized in that after retraction of the second tool (13) both tools (12, 13) are moved by a rotational movement in the opposite direction of rotation to the starting position for a subsequent assembly process.

7. The method according to claim 1, characterized in that the rotational movement about the axis of the rim (1) of the rim (1) and the tire (2) is performed and the two tools (12, 13) on a rotational movement about the axis the rim (1) are prevented.

8. A device for carrying out the method according to any one of the preceding claims with a holding device for holding a rim, a first tool with a tire engaging portion, a first guide means on which the first tool is movably guided and supported, a first drive device through which the first Tool is movable to a working position on the rim, and a rotary drive device which is adapted to set the first guide means and the first tool or the holding means of the rim in a rotational movement about the axis of the rim, characterized by a second tool (13) with a tire engagement region, which is movably guided and supported on a second guide device (11) and is movable independently of the first tool (12) by a second drive device (15) into the working position on the rim (1), the two tools ( 12, 13) are arranged to one another, that their two working positions with respect to the axis of the rim (1) each diametrically opposed.

9. Apparatus according to claim 8, characterized in that the guide means (10, 1 1) of both tools (12, 13) together by the

Rotary drive device about the axis of the rim (1) are rotationally driven.

10. Device according to one of claims 8 or 9, characterized in that the tools (12, 13) parallel to the axis of the rim to the guide means (10, 11) are movably guided.

1 1. Device according to one of the preceding claims, characterized in that each tool (12, 13) has a bead guide (16) and a pressure roller (17).

12. The device according to claim 8, characterized in that the holding device for holding the rim (1) by the rotary drive device about the axis of the rim (1) can be driven.