DE8337492U1 - Membrane coupling - Google Patents

Description

BHS-Bayerieche Berg-, Hütten- and Salzwerke Aktiengesellschaft Munich

Membrane coupling

The innovation relates to a membrane coupling with at least a flange and at least one on it on the outside diameter connected membrane washer, which are arranged between two connecting parts «

Such membrane couplings are required more and more frequently, especially in the case of high-speed drives, for general reasons Challenges such as vibration-free power transmission, long service life and absolute freedom from maintenance.

Diaphragm couplings meet these requirements most comprehensively due to their special design features: They have low weight due to the all-steel construction; they can be balanced as a fully assembled coupling; they are wear-free and do not require lubrication.

Diaphragm couplings are also capable of misalignment Balance between the driving and the driven machine through the material elasticity of the membrane disks. Where the prime mover and the driven unit are at a greater distance from one another, two diaphragm couplings are used as double joint couplings. Achieved thereby one also compensates for larger shaft misalignments;

. In addition, a reduction in the restoring forces and the associated adverse effects on the bearing of the connecting shafts.

The continuing trend towards higher powers and higher speeds also increases the demands on such clutches quite considerably.

The well-known membrane couplings meet these requirements but not to the desired extent: In the known types, the connection of the membrane on the outer diameter of the flange is done exclusively by a larger number of Fitting bolts. In addition to the necessary tightening torque and the torque to be transmitted at high speeds, these screws are also activated by their own centrifugal force It is highly stressed that the maximum speed acceptable to the clutch is determined by this screw stress.

With great powers and high speeds it comes in this Context suggests that the pitch circle diameter of these close-fitting bolts must be reduced due to their stress, which in turn disadvantageously reduces the elasticity of the membrane disk or increases the restoring forces.

But if you wanted to maintain the level of elasticity, you would have to With a smaller diameter, the membrane wall thickness can be reduced, which in turn would increase the risk of membrane ruptures.

The illustration of these interrelationships shows the limits for such known membrane couplings Screw connections of this high quality are very complex and in expensive to manufacture. They also involve the risk that, after dismantling the coupling, there will be an incorrect assignment of the results in individual parts, so that additional unbalances are available when starting up again, which a safe Endanger the course of the clutch.

• · ι ■ · ·

The connection of the membrane with a hub-like inner part is carried out differently in the known types. Again, the most common is the connection by means of screws, but with additional teeth for the torque transmission. This toothing is necessary because the relatively small durometer makes it safe Torque transmission becomes a criterion here. Such a connection, however, is again complicated in construction and expensive in production and dangerous in terms of additional discomfort after assembly.

A more problem-free connection between the membrane and the inner part have known designs through the use of electron beam welding, the most common being welding is applied by means of an axially directed electron beam. However, the axial electron beam welding leads to unfavorable local stress concentrations at the connection point due to the lack of sufficiently large transition radii and thereby an increased susceptibility to damage.

In the known designs, the hubs continue to form the connecting shafts and the flanges together form a one-piece, inelastic part. The necessary, all-round processing makes this part expensive.

In addition, there is another flange on the outside diameter of the flange, which extends as far as the hub-like inner part Safety gear attached. The purpose of this device is to guide the hub-like inner part which is then released, at least over the discharge period, and to prevent it from being thrown away if the membrane ruptures. Also this part is expensive in the Manufacturing. In addition, the mass of the entire unit increases considerably, especially in the area of the largest diameter. As operating experience and theory show, this is Size of the rotating mass of decisive importance for the dynamic behavior of rotating parts, which leads to the design rule that the weight of such parts is small keep.

The task of the present hiring is based on the to create a membrane coupling which, with a simple structure, has a higher performance ^ has speed and allows higher speeds.

According to the invention, this problem is solved by "also the flange is designed as a membrane disk and that both MetaJaranseheiben with each other and with the adjoining elementary ** th are connected via electron beam welding. Through this

(there is the advantage / that as a rule two membranes on the

outer diameters are connected to each other and on the inner diameter each wells are connected to the neighboring parts, whereby through

I created a simply structured unit in this construction

f will.

Advantageous further developments result from the subclaims.

'■ The present innovation has the following advantages:

\ - the all-round connection of the membranes by means of electrons; avoids beam welding to a permanent connection

'' Difficulty compared to the usual, detachable connections

■. transmission of torque at high speeds

b and on reassembly. In addition, the mass is small

1 ner and cheaper to manufacture.

- The welding allows a radially directed electron beam large transition radii, thereby avoiding local stress concentrations.

- The arrangement of two membranes to form a pair of membranes and the possibility, due to the lack of screw connections The ability to make the outer diameters of the diaphragm larger makes the flexibility of such couplings important larger or the restoring forces smaller. Thanks to these features, it is also not necessary to use the elastic membrane disc to be made extremely thin in order to achieve sufficient elasticity, which leads to inexpensive manufacture.

- A safety catch can be formed by a simple cylindrical extension which prevents the Sleeve in the event of a diaphragm rupture .prevented without significantly increasing the construction costs and the coupling mass.

- If it is necessary to keep it as short as possible, the hub of the connecting shaft can also be connected directly to one membrane using a simple flange connection.

- The assembly with the connecting shafts can advantageously take place via a centering collar, the length of the Coupling can be reduced in size during installation or removal by means of screws or other simple devices to such an extent that the connected connecting parts can move away is not necessary.

- In special cases, the coupling can be designed with an axial backlash limitation, whereby the basic concept is retained.

The innovation is described in more detail below with reference to the exemplary embodiments shown in the drawing. In the Drawing show:

1 shows a longitudinal section through a coupling in a standard design;

2 shows a longitudinal section through a coupling with screwed-on hubs;

3 shows a longitudinal section through a coupling with an axial play limitation;

Flg. 4 shows a partial section of a pair of membranes shortened by screws.

The Menbran coupling shown in Fig. 1 consists of two identically designed pairs of membranes, which are composed of the membranes 1 and 2 or 1 * and V , respectively. The Ver-

The two membranes 1 and 2 are bonded to the outer diameter via a centering and a radial electron beam welding 3. On the inner diameter are the membranes 1 or 1 * with the hubs 4 or 4 'and the membranes 2 or 2 * with a sleeve 5 over-centering and radial electron beam welding 6 and r7i connected ^; i.

The hubs 4 have a flange 8 with a centering collar for attachment to connecting shafts; furthermore a cylindrical extension 9, which protrudes into the sleeve 5 with radial play. This extension 5 serves as a safety device and ensures in the event of a diaphragm rupture, at least over the run-out period, that a safe operation is given by the then effective sleeve 5 on the extension 9 of the hub 4.

The membranes 1 and 2 or 1 'and 2' also have bores arranged opposite a common hole cutter 10 and 11.

Fig. 2 shows an embodiment with intermediate pieces 40 and 40 40 *, these being attached to the hubs 13 and 13 * of the connecting shafts are flanged. The connection between the intermediate pieces 40 and 40 'and the hubs 13 and 13' takes place via connecting screws 14; the pitch circle diameter for these connecting screws 14 is not larger than usual Flanged hubs, so that there are no problems with the speed. As a safety device, the extension 9 is directly on Intermediate piece 40 or 40 * provided, which simplifies the process the design results. The shown execution stirrn shortens the overall length L compared to the design according to FIG. 1.

Fig. 3 shows an embodiment with axial backlash limitation. Here is in the one acting as a safety gear cylindrical extension 9 a pressure rod 15 is supported by ball sockets 16 and adjusting screws 17. This form of execution allows the transmission of axial forces between the two connecting shafts, without the membranes being stressed.

-9- 1

Due to the articulated, made from a bearing material Ball sockets 16, the flexibility of the membrane coupling pairs 1 and 2 or 1 'and 2' is only insignificantly reduced. The play in the ball sockets is determined by adjusting screws 17 16 set '. · ■

Fig. 4 shows how in a simple manner the total length L of such couplings can be shortened by at least the length of the two centering collars B to an assembly length L ¹ = L - 2 x B.

This allows the coupling forming a unit with the coupling pairs 1 and 2 or 1 · and 2 'and the sleeve 5 can be installed or removed without the attached machines axially displaced Need to become.

Instead of electron beam welding, each one is also similar Welding process applicable.

PenntArtwUt · Dfpl.-lng.E.Eder Ulna «.Schleschke WMM 40 - EIlHMIMr. U

Claims (7)

Protection claims: 1. Membrane coupling, with at least one flange and at least one membrane disk connected to it at the outer diameter, which are arranged between two connecting parts, characterized in that the meat is also designed as a membrane disk (1, 1 '; 12, 12') and that both membrane disks (1, 2; 1 ¹ , 2 '; 12, 2; 12 ¹ , 2') are connected to one another and to the adjacent elements via electron beam welding. 2. Membrane coupling according to claim 1, characterized in that the two membrane disks (1, 2; 1 ^f , 2 '; 12, 2; 12', 2 ') are connected to one another on the outer diameter and to the adjacent elements on the inner diameter. 3. Diaphragm coupling according to claim 1 and 2, with at least one sleeve arranged between the connecting parts, characterized characterized in that on both sides of the sleeve (5) a pair of membrane disks (1, 2; 1 ', 2'; 12, 2; 12 ', 2') is arranged. -Κ:! · 08-ob 4. Diaphragm coupling according to one of the preceding claims, with a hub with a flange for attachment to a connecting shaft, characterized in that the hub (4) protrudes into the sleeve (5) below a pair of membranes has a cylindrical extension (9) (Fig. 1). 5. Membrane coupling according to one of claims 1 to 3, characterized in that in each case a membrane (12, 12 ') directly is connected to a hub (13) of a connecting shaft via an intermediate piece (40, 40 ') and a flange connection, and that the intermediate piece (40, 400) protrudes into the sleeve (5) Has extension (9 ·) (Fig. 2). 6. Membrane coupling according to claim 4 or 5, characterized in that that between the projections (9) protruding into the sleeve (5) a pressure rod (15) is arranged, which is via ball sockets (16, 16 ') inside the hubs (4, 4') supported (Fig. 3). 7. Membrane coupling according to one of the preceding claims, characterized in that in each case a pair of membrane disks | with arranged opposite one another on a common bolt circle Through bores (10, 11) is provided. ': H ml Ml IHI I *' ι '' t