WO2019011494A1

WO2019011494A1 - Deflection roller in a flexible drive

Info

Publication number: WO2019011494A1
Application number: PCT/EP2018/060687
Authority: WO
Inventors: Hubert Göser; Andre Kucharczyk; Jan-Henning Quass; Stephan Brocke
Original assignee: Contitech Antriebssysteme Gmbh
Priority date: 2017-07-14
Filing date: 2018-04-26
Publication date: 2019-01-17
Also published as: EP3652101A1; EP3652101B1; DE102017212076A1

Abstract

The invention relates to a deflection roller in a flexible drive, preferably in a lift drive with lift or supporting belts, wherein the deflection roller can be rotatably mounted and comprises several deflection disks mounted on a shaft. The flexible intermediate link, the deflection roller or the deflection disks pass around or are wound around a partial circumference on an outer peripheral surface and the deflection disks are rotatably arranged and mounted so that they can slidingly move with respect to shaft.

Description

description

Deflection pulley in a traction mechanism drive

The invention relates to a deflection roller in a traction mechanism drive, preferably in an elevator drive with elevator belt, wherein the deflection roller is rotatably mounted and a plurality of arranged on a shaft deflection pulleys for or the traction means, wherein the traction means or suspension means the deflection roller or Slices on an outer circumferential surface over a partial circumference rotates or wraps around.

In a traction drive usually a number of pulleys are required to guide the traction means and deflect, that drive rollers, driven rollers,

Clamping devices, etc. remain in compliance with regulations and at the same time the spatial and geometric features, the dimensions and the required installation space of other machine parts is taken into account. This is the case in a special way in elevator systems, in which the

Elevator car moves within a narrow elevator shaft and usually hangs on several ropes, which also move corresponding counterweights. In such elevator systems, the elevator belts or the carrying straps are guided in the elevator shaft by a series of deflection rollers in such a way that the elevator cage and counterweights can be driven safely via one or more drive rollers and can travel precisely up and down within the shaft.

In elevator technology, at least two, but usually more, suspension means, i. Elevator straps or carrying straps used in parallel. These straps are guided over a common traction sheave / drive pulley with which the

Drive torque is transmitted to the tension belt or suspension. These are typical Traction sheave lifts, in which the drive on the support means via friction forces.

In principle, a distinction is made between different types of suspension, which are determined inter alia by the ratio of the running speed of the suspension element and the traveling speed of the car in the shaft. The running speed of the support means substantially corresponds to the peripheral speed of the traction sheave and is provided by possibly provided pulleys to an integer fraction of the

Transfer driving speed of the car. This fraction is therefore basically determined by the number of pulleys on the elevator car and counterweight.

In a so-called 1: 1 suspension, both the cab and the

Counterweight attached directly to the ends of a suspension element, which rotates between the car and counterweight the drive pulley and transmits the drive torque via cable friction. In this case, the running speed of the suspension element is the same

Travel speed of the car in the shaft. Pulleys may also be used here, but not those that change the translation or ratio in the sense of a pulley. For the 2: 1 suspension, the ends of the rope are, for example, on the ceiling of a

Attached elevator shaft so that cabin and counterweight each hang by means of pulleys on the support means, which also between the car and the counterweight

Drive pulley rotates. The result is a simple pulley that can lift twice the payload at half speed compared to a 1: 1 suspension. The

Speed of the suspension element is then twice as high as the speed of travel of the car in the shaft.

As a further, rather rare and especially used in goods lifts types of suspension can also be found 3: 1 or 4: 1 suspensions, which also by the ratio of the two speeds mentioned or in principle by the number of

Classify pulleys on elevator car or counterweight. Non-driven pulleys thus play an important role in traction drives, especially in elevator systems, and there are many. In many

Elevator systems, a plurality of support means are guided side by side over one and the same pulley. These wider pulleys are then designed so that their outer surface corresponding to multiple spherically or profiled formed areas which are separated by separating flanged wheels so that the support means adjacent to each other, but separated from each other can circulate the pulley. In particular, in this case, in which a plurality of parallel support means or straps are guided over the same pulley, resulting in the interaction between pulleys and suspension often quite significant noise problems. Namely, there are small due to elongation or expansion of the support means

Relative movements between the individual side by side current carrying means and the guide roller. This creates so-called "stick-slip effects", namely vibrations, which arise due to a transition between adhesion,

Breakaway, sliding and rolling friction and thus the source of the noise are. Even by an improper escape of the individual pulleys or pulleys to each other and thereby resulting "diagonal train" relative movements between the individual side by side current carrying means and the pulley can arise, which can also lead to noise.

Since, of course, a dependence on the coefficient of friction is given for these sound effects, special coatings are already used today to reduce the coefficient of friction in the friction pairing between support belt and deflection rollers. In the course of time, however, such coatings change due to wear or contamination, so that then the noise can again occur reinforced.

WO 2016-019135 AI discloses another solution to the noise problem in the form of a deflection roller whose deflection plate, which indeed interacts with the support means on its surface, by means of at least one bearing rotatably mounted on the shaft of the Guide roller is mounted. The bearing shown there is not specified. Only in the figures, a conventional ball bearings can be detected. However, the solution presented here includes a construction in which the entire and only storage of the deflection roller in the storage of deflection plates on the shaft. In principle, therefore, the hitherto usual storage of fixedly connected to the pulleys pulley at both ends of its shaft was abandoned in favor of a storage of the pulleys directly on the then fixed at both ends shaft. Such a solution is relatively complicated, especially if each of the deflection plates must be stored with individual bearings on the shaft of the guide roller. If, however, on the other hand, a plurality of fixedly connected pulleys on optionally one

common intermediate tube are mounted on the shaft, resulting in several adjacent strap not the desired effect of

Noise reduction. So for the invention, the object was to provide a pulley, in which said noise effects do not occur or at least greatly reduced, even if the same pulley is used for several adjacent straps, which has a simple and inexpensive construction and a high durability provides.

This object is achieved by the features of the main claim. Further advantageous embodiments are disclosed in the subclaims.

In this case, the deflection plates are arranged to be slidable relative to the shaft so as to be able to slide, so that it is rotatable on the shaft in the region of the sliding friction. By such

Rotational mobility in Gleitreibungsbereich be compensated for low relative movements between the deflection of the individual juxtaposed support means and the shaft of the guide roller and not transmitted from one deflection pulley to the other. The slidable rotation provided here is not to be compared with a plain bearing, which is used in the range of very high speeds, for example, for crankshafts. The connection formed here between deflecting pulley and shaft is indeed free of play and to a small degree frictionally, but still rotatable / rotatable under

Overcoming the static or sliding friction between the shaft and the deflection pulley. This inventive sliding rotatability is achieved by an adapted

Material pairing and tolerance between the hub of the deflection pulley and the shaft. The shaft can be formed here, for example, steel, while the deflection plate consists at least in the region of the hub of a lubricious plastic. Preferably, a plastic of high strength and low coefficient of friction can be used here in the region of the hub. For example, special polyamides or HDPE (High Density Polyethylene) are suitable. Of course, the deflection discs can also be made entirely of such a plastic, if the load in the respective application allows this. For this purpose, in particular contributes to an advantageous development, which consists in the fact that the deflection plates are arranged side by side and arranged rotatable relative to the shaft and relative to each other for slidable movement. In order for a transfer of relative movements of a deflection plate on the adjacent deflecting disc is prevented with certainty. Preferably, and in the sense of a uniform axial and radial loading of the deflection pulleys by the tensile forces transmitted by the support means, the deflection disks between the bearings of a two-sided

Shaft bearing arranged side by side.

A further advantageous embodiment consists in that the deflection pulleys arranged next to one another have or form a flange on at least one side.

Flush discs are used to guide the suspension / elevator belts and prevent the suspension means can abut or skip each other.

A further advantageous embodiment is that between or next to the arranged on the shaft pulleys relative to the latter and the shaft slidably rotatable separate flanged wheels are arranged. This additionally prevents that Too strong rub the suspension elements on the flanges and heat up. In this way, the flanged wheels in the Gleitreibungsbereich with twisting, if wear girths / suspension means. The rotational mobility between the pulleys with each other and between the pulleys and flanges is of course also achieved by the above-mentioned tolerance adjustment and material pairing.

A further advantageous embodiment is that the shaft is hollow and the storage of the deflection roller takes place within the hollow shaft. By such

Training gives you constructive freedom in the training and storage of the entire pulley.

A further advantageous embodiment is that between shaft and

Deflecting discs are arranged sliding rotatable receiving sleeves, i. So between the outer surface of the shaft and the inner surface of the

Hub / receiving bore of the deflection plate sliding sleeves or slidable support sleeves are provided. In such a configuration, in which the slidable rotatability of the deflection plate is provided by a sleeve on the shaft, the

Mobility in the field of sliding friction can be provided very precisely by the choice of materials alone the sleeve.

Usually, the shaft of such a deflection roller made of metal, preferably made of steel. A sliding sleeve arranged between deflecting disk and the shaft can then be produced from different materials, preferably from a plastic of high strength and low coefficient of friction. For example, special polyamides or HDPE (High Density Polyethylene) are suitable, as mentioned above.

This can be easily replaced after a certain period and any wear of the sleeve latter and thus operate the entire pulley again noiseless. A further advantageous embodiment also in the sense of explosion and fire protection is that the receiving sleeves are designed antistatic and thus can accumulate no charges.

A further advantageous embodiment consists in that the slidable rotatability of the deflecting disks on the shaft is provided by a sliding layer or sliding coating on the shaft, on the receiving sleeve or in the hub of the deflecting disks, preferably by a sliding layer or sliding coating with polytetrafluoroethylene. The advantage is obviously that not the entire component or its material must be changed in order to achieve the displacement of the invention, but that only a coating / surface treatment is required, which also can be easily replaced or replaced. Reference to an embodiment of the invention will be explained in more detail. Show it

1 is a lift system in a 2: 1 suspension as a schematic diagram,

Fig. 2 shows one of the pulleys according to the invention an elevator system according to Fig. 1 in cross section.

Fig. 1 shows a schematic diagram of an elevator system 1 in a 2: 1 suspension type, in which the cable ends are attached to the ceiling of a hoistway. Cabin 2 and counterweight 3 each hang by means of deflection rollers 4a, 4b on the support means. 5

The or the support means revolve a driven by a motor, not shown here traction or drive pulley 6, which between cabin and

Counterweight is arranged in the upper region of the elevator shaft. This creates a simple pulley. The running speed of the support means 5 is then twice as high as the driving speed of the car 2. The tensile force is on the

Drive pulley 6 transmitted by cable friction. The support means 5 is executed here as a triple parallel guided belt. Thus, the pulleys, of which one, namely the guide roller 4 on the car roof, shown in cross section in Fig. 2, of three parallel running straps / Gurtgurt- parts 5 a, 5 b and 5 c looped around.

The support belt 5 and, accordingly, all the carrying belt parts 5 a to 5 c are designed as a flat belt and reinforced with cords 7 as a tension member. The construction of the carrying strap can be seen in principle in the lower half of FIG. 2, namely where the carrying belt and the deflection pulleys are shown in section.

The deflection rollers 4, in Fig. 2, the deflection roller 4a on the car, are rotatably mounted and have a plurality of arranged on a shaft 8 deflecting disks 9a, 9b, 9c. The carrier belt 5 as traction means wraps around the deflecting disks 9a to 9c on an outer circumferential surface over a partial circumference.

The deflecting discs 9a, 9b, 9c are on the and relative to the shaft 8 backlash, but slidably mounted.

The deflecting disks 9a, 9b, 9c are between the bearings 10 of a two-sided

Shaft bearing arranged side by side and formed relative to the shaft 8 and also relative to each other slidably rotatable. In addition, the deflection pulleys 9a, 9b, 9c arranged next to each other form, on one side, a flange I 1a, 1 lb and 11 c. In addition, a separate, in addition to the right on the shaft 8 arranged deflecting disc 9c arranged flange 1 ld is provided which is formed relative to the guide pulley 9c and the shaft also in the manner of the invention slidably rotatable.

By forming according to the invention such pulleys circulating several times by suspension elements, small relative movements between the deflection pulleys of the individual support elements running side by side and the shaft of the deflection pulley are achieved

balanced. Noise is thus avoided according to the task. LIST OF REFERENCE NUMBERS

(Part of the description)

1 lift system

2 cabin

3 counterweight

4a, 4b deflection roller

5a, 5b, 5c pulling or carrying means, carrying belt, girth strap part

6 traction sheave, drive pulley

7 tension members, corduroy

8 wave

9a, 9b, 9c deflection pulleys

10 bearings

l la, l lb, l lc, l ld Flange

Claims

claims

1. pulley (4a, 4b) in a traction drive, preferably in an elevator drive with elevator or shoulder strap, wherein the deflection roller (4a, 4b) is rotatably mounted and a plurality of on a shaft (8) arranged deflection pulleys (9a, 9b, 9c ) for the one or more traction means, wherein the traction means (5a, 5b, 5c) rotates or wraps around the diverting pulley or deflecting pulleys on an outer peripheral surface over a partial circumference, characterized in that the deflecting pulleys (9a, 9b, 9c) relative to Shaft (8) are arranged rotatably rotatable or formed.

2. pulley according to claim 1, wherein the deflecting discs (9 a, 9 b, 9 c) arranged side by side and relative to the shaft (8) and are arranged rotatably relative to each other for sliding, preferably between the bearings (10) of a two-sided

Shaft bearings are arranged side by side.

3. pulley according to claim 1 or 2, wherein arranged side by side

Deflection discs (9a, 9b, 9c) at least on one side a flange (I Ia, 1 lb, 11c) or form.

4. pulley according to one of claims 1 to 3, in which between or next to the arranged on the shaft pulleys (9 a, 9 b, 9 c) relative to the latter and the shaft slidably rotatable separate flanged wheels (1 ld) are arranged.

5. pulley according to one of claims 1 to 4, wherein the shaft (8) is hollow and the bearing of the guide roller takes place within the hollow shaft.

6. pulley according to one of claims 1 to 5, wherein between shaft (8) and

Deflection pulleys (9a, 9b, 9c) one or more slidably rotatable

Receptacles are arranged.

7. pulley according to claim 6, wherein the receiving sleeves are formed antistatic.

8. pulley according to one of claims 1 to 7, wherein the slidable

Rotatability of the pulleys on the shaft through a sliding layer or

Slip coating is provided on the shaft, on the receiving sleeve or in the hub of the deflection plates, preferably by a sliding layer or sliding coating with polytetrafluoroethylene.

9. elevator system with an elevator drive, in which several parallel running Aufzugsbzw. Supporting straps are provided, wherein at least one deflection roller according to one of claims 1 to 8 is formed.