V-belt and method for the production thereof

Abstract

V-belt from an elastomeric material, composed of an in each case annular V-belt substructure and V-belt back that are connected to one another and are produced as a V-belt composite from two individually tailored and conjointly vulcanized part-blanks, specifically a first part-blank that is configured as a V-belt substructure and includes the belt profile, and a second part-blank that is configured as a wound V-belt back, wherein the V-belt has one or a plurality of tiers of reinforcing support cords and on the belt back and/or on the profile side of said V-belt has a woven fabric, wherein the reinforcing support cords are radially disposed so as to be in a circumferential plane in the V-belt back and so as to be outside the V-belt substructure.

Claims

1. A method for producing a V-belt or a composite V-belt composed of two annular interconnected parts which comprise a V-belt substructure and a V-belt back, wherein the V-belt is produced as a V-belt composite from two individually tailored and conjointly vulcanized part-blanks which comprise a first part-blank that is configured as a wound V-belt substructure and includes a belt profile, and a second non-profiled part-blank that is configured as a wound V-belt back, wherein the V-belt has one or a plurality of tiers of reinforcing support cords and on the belt back and/or on the profile side the V-belt has a woven fabric, wherein the reinforcing support cords are radially disposed so as to be substantially in a circumferential plane in the V-belt back and so as to be outside the V-belt substructure, wherein after vulcanizing the first part-blank is provided for engaging in a belt pulley, and wherein the V-belt comprises an elastomeric material; wherein a V-belt composite of a plurality of V-belts lying beside one another is produced from a composite-body blank, wherein the composite-body blank is produced from two part-blanks in the form of wound cylindrical bodies comprising a first part-blank that is configured as a wound V-belt substructure and from a second part-blank that is configured as a wound V-belt back, wherein the following method steps are provided: a) producing the first part-blank that is configured as a wound V-belt substructure from a rubber mixture and a woven fabric, wherein: one or a plurality of tiers of non-vulcanized rubber are wound onto a flat construction drum until a rubber layer having a thickness that is predetermined for the V-belt substructure has been applied to the construction drum; one or a plurality of tiers of woven fabric are wound onto the rubber layer; a layered composite of the rubber layer and the woven fabric tiers thus created on the construction drum is shaped into a plurality of V-belt profiles that lie beside one another by way of a forming roller that is configured or profiled, respectively, so as to be complementary to the V-belt profile; b) producing the second part-blank that is configured as a wound V-belt back from a rubber mixture, from a reinforcing support cord and a woven backing fabric; wherein: one or a plurality of non-vulcanized tiers of rubber is/are wound onto a flat construction drum; one or a plurality of tiers of reinforcing support cords is/are wound; one or a plurality of further non-vulcanized tiers of rubber is/are wound until a rubber layer that is reinforced with reinforcing supports, having a thickness that is predetermined for the V-belt back, has been applied to the construction drum; one or a plurality of tiers of woven backing fabric is/are wound onto the rubber layer that is provided with reinforcing supports; a layered composite of the second part-blank thus created is compressed on the construction drum by way of a flat forming roller; c) whereupon the first part-blank having been produced upside down: is cut from its construction drum, turned over or inverted, respectively, and with the profile lying on the inside by way of a rubber strip that comprises the cutting region is adhesively bonded so as to form a ring; and is positioned about two divergible vulcanizing drums that are provided with a complementary external profile such that said first part-blank envelops both vulcanizing drums and bears on parts of the circumferences of said vulcanizing drums; d) the layered composite of the second part-blank is pushed over, or is positioned on, respectively, the first part-blank that already envelops the displaceable vulcanizing drums; e) whereupon the vulcanizing drums are diverged and the two part-blanks on the vulcanizing drums, while revolving under a compression belt, are conjointly vulcanized so as to form the V-belt composite; f) and singularizing the V-belt composite into individual V-belts or composite V-belts from at least two V-belts that are disposed beside one another is performed after the vulcanization.

2. The method as claimed in claim 1, wherein the V-belt profile, and the profiled forming roller, respectively, in the production of the first part-blank are configured such that spacing “e” of the centerlines of two V profiles that lie beside one another is larger than 10 mm.

3. The method as claimed in claim 1, wherein the non-vulcanized rubber tiers in the production of the first part-blank are wound onto the construction drum under the influence of heat.

4. The method as claimed in claim 3, wherein the rubber tiers are at most 1.5 mm thick.

5. The method as claimed in claim 1, wherein the layered composite of the second part-blank in the production of the second part-blank is wound onto the construction drum and/or compressed thereon under the influence of heat.

6. The method as claimed in claim 1, wherein chemical sealing of the cutting edges is performed, in particular by applying isocyanate, after the singularization of the V-belt composite into individual V-belts or composite V-belts.

Description

(1) The invention is to be explained in more detail by means of an exemplary embodiment and in schematic drawings. In the figures:

(2) FIG. 1 shows a composite V-belt according to the invention in the cross section;

(3) FIG. 2 schematically shows the production of the first part-blank which is from a rubber mixture and a woven fabric and which forms the V-belt substructure in the finished belt;

(4) FIG. 3 schematically shows the production of the second part-blank which is from a rubber mixture, a reinforcing support cord and a woven backing fabric, and which forms the V-belt back in the finished belt; and

(5) FIG. 4 schematically shows the further progression of the production method for further processing and vulcanizing of the two blanks.

(6) FIG. 1 shows a composite V-belt 1 according to the invention in the cross section on a complementary belt pulley 5. The V-belt 1 is composed of a V-belt substructure 2 and a V-belt back 3.

(7) Both parts are indicated by the dot-dashed separation line 4 in FIG. 1. The two interconnected and in each case annular parts, i.e. the V-belt substructure and the V-belt back, mutually abut at said separation line. In reality, a separation line is of course no longer present or to be seen here in the finished state shown, since both annular parts have been completely interconnected by the vulcanization. However, by the position of the reinforcing support cords in exactly the same plane in the back structure outside the engagement of the disk it can be seen that two parts were present.

(8) The composite V-belt 1 here is composed of three V-belt profiles 6, 7, and 8 that are disposed beside one another and connected to one another. The spacing “e” of the centerlines of two V-belt profiles that lie beside one another here is 12 mm.

(9) The composite V-belt has a tier of reinforcing support cords 9 which are radially disposed so as to be in a circumferential plane in the belt back 3 and so as to be outside the V-belt substructure 2. In the absence of unfavorable impediments on account of any previous deformation in the production, the reinforcing supports in the mixture matrix are all located in a radial plane, thus “as if wound”, and do not have any mutual radial displacement whatsoever.

(10) The composite V-belt on the belt back thereof and on the profile side thereof has in each case one woven fabric 10, 11.

(11) The composite V-belt illustrated in FIG. 1 is moreover not be confused with a V-ribbed belt which at a first glance does look similar but in terms of the load-bearing capacity, the loading, the dimensions, the ruggedness, and the field of application thereof belongs to an entirely different category of drive belts which is also not comparable from the point of view of production.

(12) FIGS. 2, 3, and 4 by means of only schematic drawings, when viewed together, show the production method according to the invention.

(13) FIG. 2 herein shows the production of the first part-blank from a rubber mixture and a woven fabric, said first part-blank forming the V-belt substructure 2 in the finished belt. Herein one or a plurality of tiers of non-vulcanized rubber is/are wound onto a flat construction drum 12 until a rubber layer 13 having a thickness that is predetermined for the V-belt substructure has been applied to the construction drum. Thereafter, one or a plurality of tiers of woven fabric 11 is/are wound onto the rubber layer. The layered composite of the rubber layer 13 and the woven fabric tiers 11 thus created on the construction drum 12 is shaped into a plurality of V-belt profiles 6, 7, and 8 that lie beside one another by way of a forming roller 14 (counter roller) that is configured or profiled, respectively, so as to be complementary to the V-belt profile.

(14) FIG. 3 herein shows the production of the second part-blank from a rubber mixture, from a reinforcing support cord, and from a woven backing fabric. Here, a plurality of non-vulcanized tiers of rubber 15 are wound onto a flat construction drum 16, thereafter one or a plurality of tiers of reinforcing support cords 9 and subsequently again one or a plurality of further non-vulcanized tiers of rubber 17 are wound thereonto. This is undertaken until a rubber layer that is reinforced with reinforcing supports, having a thickness that is predetermined for the V-belt back, has been applied to the construction drum. One or a plurality of tiers of woven backing fabric 10 is/are then wound onto the rubber layer that is provided with reinforcing supports.

(15) The layered composite 21 of the second part-blank thus created is compressed on the construction drum by way of a flat forming roller (not illustrated in more detail here).

(16) In a further production step, the first part-blank having been produced upside down on the construction drum 12 is cut from the construction drum 12, turned over or inverted, respectively, and with the profile lying on the inside by way of a rubber strip that comprises the cutting region is adhesively bonded so as to form a ring 18, specifically so as to form that part of the V-belt that later forms the V-belt substructure.

(17) FIG. 4 schematically shows the further progression of the production method. The ring 18 herein is positioned about two divergible vulcanizing drums 19, 20 that are provided with a complementary external profile such that said first part-blank envelops both vulcanizing drums and bears on parts of the circumferences of said vulcanizing drums.

(18) Thereupon the layered composite 21 of the second part-blank, i.e. the subsequent back-composite is pushed over, or is positioned on, respectively, the first part-blank that is already positioned on the displaceable vulcanizing drums and envelops the latter. As has already been illustrated above, the first part-blank has already been placed as an inverted ring 18 that has been reconnected in the running position.

(19) Thereafter the vulcanizing drums 19 and 20 are diverged and the two part-blanks lying on top of one another on the vulcanizing drums, while revolving under a compression belt 22, are conjointly vulcanized so as to form the V-belt composite.

(20) Singularizing the V-belt composite into individual V-belts or composite V-belts is performed after the vulcanization, that is to say that individual rings are cut from the V-belt composite.

LIST OF REFERENCE SIGNS

Part of the Description

(21) 1 Composite V-belt 2 V-belt substructure 3 V-belt back 5 Theoretical separation line between the V-belt substructure and the V-belt back 5 Belt pulley 6 V-belt profile 7 V-belt profile 8 V-belt profile 9 Reinforcing support cords 10 Woven fabric (woven backing fabric) 11 Woven fabric (woven profile fabric) 12 Construction drum for the V-belt substructure 13 Rubber layer 14 Forming roller/Counter roller 15 Rubber tiers 16 Construction drum for the V-belt back 17 Rubber tiers 18 Inverted ring (inverted first blank/V-belt substructure) 19 Vulcanizing roller 20 Vulcanizing roller 21 Layered composite (V-belt back/second blank) 22 Compression belt