WO2018077501A1

WO2018077501A1 - Method for producing a solid rubber tire and solid rubber tire

Info

Publication number: WO2018077501A1
Application number: PCT/EP2017/069987
Authority: WO
Inventors: Matthias-Stephan MÜLLER; Steffen Hallmann; Carsten Minx; Peter Schmidt; Nikolas HEINRICH; Nadiah-Hanim JASNIE; Wolfgang NESS; Hans-Jürgen Sauerwald; Simon FRONEMANN
Original assignee: Continental Reifen Deutschland Gmbh
Priority date: 2016-10-28
Filing date: 2017-08-08
Publication date: 2018-05-03
Also published as: DE102016221266A1

Abstract

The invention relates to a method for producing a solid rubber tire comprising at least one sensor element (6) and consisting of a main body (1), a tread part (2) and lateral tire sidewalls (4), wherein the main body (1) comprises a bottom part (1a) that comes into contact with a wheel rim and a radially outer elastic part (1b), the bottom part (1a) and the elastic part (1b) are constructed by the multilayered wrapping of calendered or extruded rubber mixtures and the main body (1) is provided with the tread part (2) and the tire sidewalls (4) and is subsequently vulcanized. The method comprises the following method steps: - forming the bottom part (1a) or the main body (1) and subsequent vulcanization of the bottom part (1a) or the main body (1) in a first heating mold, - forming at least one well (5) on the surface of the vulcanized bottom part (1a) or main body (1), - introducing at least one sensor element (6) into the well (5).

Description

description

Process for producing a solid rubber tire and solid rubber tire

The invention relates to a method for producing a solid rubber tire containing at least one sensor element from a base body, a tread part and lateral tire sidewalls, wherein the main body has a bottom part coming in contact with a rim and a radially outer elastic part, wherein the bottom part and the elastic part by multilayer winding calendered or extruded

Rubber compounds are constructed and wherein the main body with the

Tread part and the tire walls and then vulcanized.

The invention further relates to a solid rubber tire which contains at least one sensor element and has a tread part, lateral tire flanks and a base body made of a bottom part coming into contact with a rim and a radially outer elastic part.

Blanks for solid rubber tires are according to the prior art in a

Made construction process in which individual calendered rubber mixtures for the bottom part, the elastic part and the tread part successively multilayer on a winding device, a winding receptacle, wound and the lateral

Tire flanks are pressed. Subsequently, the ready-built green tire is vulcanized in a heating mold, which impresses the optionally provided profiling in the tread part and gives the solid rubber tires the desired outer contours. During vulcanization, ie the conversion of the rubber mixtures into vulcanized rubber, massive and uncontrollable flow processes of the rubber mixtures take place. In the known from DE 10 2011 052 808 AI, the usual structure having solid rubber tires a pressure or deformations detecting sensor element is installed radially within the tread part. This document contains no information on how these sensor elements have been introduced. It is therefore considered that they are positioned during a winding operation of one of the rubber compound layers.

Sensor elements in solid rubber tires are of great interest since they can be used in particular to monitor the "product life cycle", ie the tire quality, which is usually very expensive and costly to produce solid rubber tires.

In particular, the mentioned flow processes during vulcanization cause the sensor elements in the finished vulcanized tire are no longer in the original positions and / or that the sensor elements are destroyed or damaged in the course of vulcanization. By means of the previously known methods, it has not been possible to reliably introduce sensor elements from damage safely and at defined positions in solid rubber tires.

The invention is therefore based on the object to provide a method which allows positioning of the sensor elements in the construction of the solid rubber tire, which prevents destruction or damage to the sensor elements during vulcanization. The solid rubber tire according to the invention should have correspondingly positioned sensor elements.

The stated object is achieved according to the invention with a method with the following successive method steps:

a) forming the bottom part or the base body and then vulcanizing the bottom part or the base body in a first heating mold to form a surface with a substantially cylinder jacket-shaped top side and side walls,

b) forming at least one recess on the surface of the vulcanized bottom part or basic body, c) introducing at least one sensor element into the recess, d) constructing the bottom part or the base body to the complete

Solid rubber tires and vulcanizing the solid tire in a second heating mold.

A solid rubber tire according to the invention is characterized in that the at least one sensor element is positioned either between a lateral tire sidewall and the main body or between the bottom part and the elastic part.

By attaching the sensor elements according to the invention these are on the

concerned tire components fixed so that their position in the other

Tire structure and vulcanization unchanged. In addition, the sensor elements during operation of the solid rubber tires against slipping within the

Solid rubber tires reliably secured. In addition, the inventive method allows a particularly "gentle" installation of the sensor elements in solid rubber tires, which ensures that the sensor elements remain in fully functional condition over the life of the solid rubber tire.

The invention therefore makes it possible to reliably detect and record physical quantities (temperature and pressure) that provide information about the tire condition during operation of the vehicle. The measurement data can subsequently be evaluated accordingly, which can increase the knowledge of changing physical variables during tire use. This makes it possible, for example, to monitor the quality of tire components or their occurring in the course of operation aging and / or quality decrease. Aging occurs, for example, by the high temperatures of about 120 ° to 130 ° C. occurring during operation, at which the polymer chains of the rubbers of the rubber materials degrade, which reduces the hardness of the rubber material and thus adversely affects the tire quality. For the

Retreading the solid rubber tire is of particular interest in particular the quality of the body, which is not visible from the outside. Further, jounce paths and the rigidity of the entire tire can be detected depending on the period of use. This is done in particular by means of a vibrating in the ultrasonic range Base plate, which can receive and process the signal, in particular a reflection signal, the sensor elements. Sensor elements incorporated in accordance with the invention provide a reliable solid rubber tire monitoring system as well as an early warning system which warns in time of impending tire failure.

In addition, the information obtained from the physical quantities can be used for further targeted development of solid rubber tires. It is also possible for customers to understand the life cycle of the solid rubber tire and to control tire quality. If the recorded data are transmitted or transmitted accordingly, central monitoring of the tires of vehicle fleets is also possible.

Further features, advantages and details of the invention will now be described with reference to the drawing, which schematically illustrates embodiments of the invention. Show

1 a to 1 d show successive process stages in the construction of a

Solid rubber tire, according to an embodiment of the invention,

Fig. 2a to Fig. 2d successive process stages in the construction of a

Solid rubber tire, according to another embodiment of the invention, and

Fig. 3a to Fig. 3d successive stages of the process in building a

Solid rubber tire, according to a third embodiment of the invention.

Solid rubber tires manufactured and constructed according to the invention are in particular tires for mobile machines, such as industrial trucks, for example forklifts or telehandlers.

Fig. Id, Fig. 2d and Fig. 3d show cross sections of a solid rubber tire of a

Base body 1, a tread part 2 and lateral tire sidewalls 4. The main body 1 has a radially inner bottom part la and arranged on this radially outer Elastic part lb on. The bottom part la, the elastic part lb and the tread part 2 are made of different vulcanized rubber materials and are each made of a separate, tailored to the desired properties of the relevant component

Rubber compound manufactured.

The bottom part la is usually made of a hard rubber material and contains at least one tensile insert - in the illustrated embodiment, five in

Circumferential direction of the tire revolving high-tensile metallic cores 3 - and is that part of the solid rubber tire, which comes into contact with a rim. The rubber material of the elastic part lb is particularly in terms of the desired suspension and

Damping properties optimized and forms an elastic intermediate layer. The tread part 2 may be provided in a conventional manner with a profiling and completes together with the lateral tire sidewalls 4 the solid rubber tire, the tire sidewalls 4 the body 1 partially cover laterally. The

Tire flanks 4 are preferably made of the rubber material of the tread part. 2

In the case of the variant of the invention illustrated in FIGS. 1 a to 1 d, the main body 1 is first of all, in a manner known per se, not shown

Winding receptacle constructed at which the intended for the bottom part la and the elastic part lb rubber mixtures are wound in the form of calendered or extruded thin layers. On a layer 1 'a (FIG. 1 a), which is usually the first layer of the rubber mixture intended for the bottom part 1 a, the cores 3 are placed next to each other in the intended number. The rubber compound of the elastic part 1b is wound up in layers on the finished floor part 1a, thus completing the basic body 1. The finished body 1 is in a first heating mold, which gives the body 1, the desired and intended cross-sectional shape, either with appropriate supply of heat and at appropriate temperature either vulcanized or vulcanized. On the outside of the vulcanized body 1 is by grinding in

Elastic part lb at least a shallow recess 5 forms (Fig. Lb). The recess 5 is in particular a circumferential recess in the circumferential direction. Alternatively, locally single depression 5 or it may be a plurality of distributed over the circumference

Recesses 5 are formed. In the next step, a sensor element 6 is positioned in the or each recess 5, whose dimensions with those of

Well (s) 5 at least largely match. In order to ensure a reliable adhesion of the sensor element 6 or the sensor elements 6, this or the bottom of the recess (s) 5 is or with a conventional primer

(Adhesive) treated. Fig. Lc shows a positioned in the recess 5

Sensor element 6. The base body 1 provided with at least one sensor element 6 is mounted on a rim-like winding device and completed with the tread part 2, wherein the tread part 2 is constructed in particular from several layers of the corresponding calendered or extruded rubber mixture and the unvulcanized tire sidewalls 4 consisting of a rubber mixture be pressed laterally (Figure ld). The thus finished solid rubber tire is introduced into a second heating mold and vulcanized in this.

In the variant illustrated in FIGS. 2 a to 2 d, the basic body 1 is constructed analogously to the first exemplary embodiment and pre-vulcanized or vulcanized in a first heating mold (FIG. 2 a). The vulcanized main body 1 is ground on at least one of its side walls, so that a shallow recess 5 is formed at least on one side wall. In the variant shown is on each side wall in the

Base body 1 protruding shallow recess 5 created (Fig. 2b). Subsequently, in each recess 5, a sensor element 6 is positioned (Fig. 2c), wherein also a

appropriate pretreatment can be done with a primer. Subsequently, the base body 1 is clamped on a rim-like winding device and it will be constructed analogous to the first embodiment, the tread part 2 and the

unvulcanized tire sidewalls 4 pressed laterally (Fig. 2d). The thus finished solid rubber tire is introduced into a second heating mold and vulcanized in this.

In the variants illustrated in FIGS. 1 a to 1 d and in FIGS. 2 a to 2d, the pre-vulcanized or vulcanized-on with at least one sensor element 6 can be provided Base body 1 are alternatively introduced into an injection press, in which by injecting a rubber mixture of the tread part 2 and the lateral

Tire sidewalls 4 are formed. The thus completed tire is then vulcanized.

In the variant illustrated in FIGS. 3 a to 3 d, in the first embodiment

Step of the bottom part la constructed in the manner already described (Figure 3a) and then pre-vulcanized or vulcanized in a first heating mold, whereby the bottom part la the desired and intended cross-sectional shape, in particular with a cylinder jacket-shaped top is awarded. In the next method step, the bottom part 1a is ground on its upper side to form at least one shallow depression 5 (FIG. 3b). Subsequently, at least one sensor element 6 is positioned in each recess 5 (FIG. 3c), the depression (s) 5 and / or the sensor element 6 or the sensor elements 6 preferably also being pretreated with a primer in this variant as well. The layers of the rubber compound forming the elastic part 1b are subsequently wound onto the bottom part 1a. The finished structure

Base 1 is provided with the tread part 2 and the tire sidewalls 4, the finished tire is vulcanized in the second heating mold as already described and finished to the solid rubber tire (Fig. 3d).

The sensor element 6 or the sensor elements 6 may also be prior to placing or attaching in a rubber mixture, in particular in a thin

Rubber mixture layer, are wrapped to ensure a particularly reliable adhesion of the sensor elements 6. To further improve the adhesion of the sensor element 6 or the sensor elements 6, the bottom part 1a and / or the elastic part 1b can be roughened in the region of their depression (s) 5, for example by means of a laser. In a recess 5 and a plurality of sensor elements 6 can be introduced. By attaching the sensor elements 6 according to the invention these are fixed to the respective tire components such that their position in the other

Tire structure and vulcanization unchanged. In addition, the sensor elements 6 during operation of the solid rubber tires against slipping within the

Solid rubber tires reliably secured. In addition, the inventive method allows a particularly "gentle" installation of the sensor elements 6 in

Solid rubber tire, which ensures that the sensor elements 6 remain in fully functional condition over the life of the solid rubber tires.

The sensor elements 6 contain in particular temperature sensors, pressure sensors

(Force transducer) or combined temperature / pressure sensors, which therefore measure the temperature in the adjoining rubber material and / or the forces acting on them. The sensor elements 6 may be embedded in metal or plastic, wherein

Plastic enters into a particularly durable connection with the surrounding rubber material. The sensor elements 6 may further have different shapes and, for example, as shown in the figures, have a flat shape in cross-section. Alternatively, the sensor elements 6 may be designed, for example, like a button. The sensor elements 6 can also circulate the entire circumference of the tire.

The sensor elements 6 may include a wireless signal transmission device for transmitting the measurements. Advantageous is the device for wireless

Signal transmission a transponder, in particular a commercially available RFID transponder. As a result, signal transmission to a receiving device, which is located, for example, in the mobile working machine itself, can take place in a simple and cost-effective manner. This also allows documentation of the data with high temporal resolution, so that the tire can be continuously monitored over its life cycle. The wireless transmission is apart from the need to provide a corresponding antenna in mobile machines, no additional space required. The use of transponders, which require no energy supply from batteries and are powered by a received radio signal with voltage, a year-long use is possible. As mentioned above are for this

low cost available RFID transponder particularly well suited. If several sensor elements 6 are installed in the solid rubber tire, an interaction between the sensor elements 6 is possible. Furthermore, an interaction between sensor elements 6 in the different solid rubber tires of a vehicle is possible.

2017/069987

References list

body

the bottom part

first location

elastic member

Tread part

core

tire wall

deepening

sensor element

Claims

claims

1. A method for producing a solid rubber tire comprising at least one sensor element (6) from a base body (1), a tread part (2) and lateral tire sidewalls (4), wherein the base body (1) has a bottom part (1a) coming into contact with a rim and a radially outer elastic part (lb), wherein the bottom part (la) and the elastic part (lb) are constructed by multilayer winding calendered or extruded rubber mixtures and wherein the main body (1) with the tread part (2) and the

Tire walls (4) and then vulcanized,

g e k n n e c i n e d u r c h,

the following consecutive process steps:

a) forming the bottom part (1a) or the main body (1) and then vulcanizing the bottom part (1a) or the main body (1) in a first heating mold to form a surface with a substantially cylinder-jacket-shaped upper side and side walls,

b) forming at least one depression (5) on the surface of the vulcanized bottom part (1a) or main body (1),

c) introducing at least one sensor element (6) in the recess (5), d) building the bottom part (la) or the base body (1) for complete solid rubber tire and vulcanizing the solid rubber tire in a second heating mold.

2. The method according to claim 1, characterized in that in step b) the

Deepening (s) (5) formed on the substantially cylinder jacket-shaped Top of vulcanised floor part (la) or vulcanized

Basic body (1) is formed or become.

A method according to claim 1, characterized in that in step b) the

Recess (s) (5) on at least one side wall of the base body (1) is or become.

Method according to one of claims 1 to 3, characterized in that step b) the recess (s) (5) as circumferential in the circumferential direction

Well (s) (5) is or will be formed.

5. The method according to any one of claims 1 to 3, characterized in that in

Step b) the depression (s) (5) is / are formed as a local depression (s) (5).

6. The method according to any one of claims 1 to 5, characterized in that the recess (s) (5) have dimensions which correspond to those of or

Sensor element (s) (6) are at least largely adapted.

7. The method according to any one of claims 1 to 6, characterized in that before step c) the sensor element (6) or the sensor elements (6) and / or the

Inner surfaces of the recess (s) (5) is treated with a primer or be.

Method according to one of claims 1 to 6, characterized in that step c) the sensor element (6) or the sensor elements (6) in a thin

Rubber compound is wrapped or become.

9. The method according to claim 1, characterized in that in step a) the bottom part (la) or the base body (1) is vulcanized or vulcanized.

10. Solid rubber tire, which contains at least one sensor element (6) and a

Tread part (2), lateral tire edges (4) and a base body (1) made a bottom part (1a) which comes into contact with a rim and a radially outer elastic part (1b),

characterized,

in that the at least one sensor element (6) is positioned either between a lateral tire sidewall (4) and the main body (1) or between the bottom part (1a) and the elastic part (1b).

11. solid rubber tire according to claim 10, characterized in that the at least one sensor element (6) is a peripheral circumferential sensor element (6).

12. Solid rubber tire according to claim 10 or 11, characterized in that the at least one sensor element (6) contains at least one temperature sensor and / or pressure sensor or at least one combined temperature / pressure sensor.

13. Solid rubber tire according to one of claims 10 to 12, characterized in that the at least one sensor element (6) has a housing made of metal or plastic.