DE8221412U1 - Torsion shaft - Google Patents

Description

ι gü / sd

M.A.N. MASCHINENFABRIK AUGSBURG-NÜRNBERG Aktiengesellschaft

Munich, July 23, 1982

Torsion swell

The invention relates to a torsion shaft consisting of an at least partially hollow one Body with a cylindrical section.

It is a torsion shaft designed as a drive shaft from DE-OS 29 46 530 known, which is designed as a fiber composite tube, the fibers of which on the 2Q ends of the rotor each around a connecting piece made of metal are wrapped. In this case, the torsional forces are transmitted via friction and adhesive forces of the adhesive between the fiber-reinforced pipe part and the metallic connection piece.

With different thermal expansions and alternating loads however, such a connection is very insecure. To increase the safety factor, is at the known device. the wrapped outer circumference of the connection piece provided with a thread. To take advantage of this, however, one must Extreme care must be taken when winding or wrapping the thread, although the thread does not change anything in the purely frictional connection.

7.2135

• · · · ff

The invention is based on the object of developing a drive shaft of the type mentioned at the outset that is simple is to be established and a secure and permanent connection with coupling elements is guaranteed.

The object is achieved according to the invention in that at at least one end of the cylindrical area adjoins a hollow connecting part, in which at least the inner cross-section is polygonal or approximately elliptical is.

over the approximately elliptical or polygonal cross-sectional area there is only a form-fitting Connection between the shaft and a coupling element. This ensures a safe transmission of the torsional forces, without being adversely affected by loosening an adhesive or the like, as in the prior art device. In addition, there are no other fastening

² ^ medium as well as screws or similar necessary, the through-holes of which would weaken the stability of the shaft ends.

Such a shaft can also manufacturing technology ² ^ very simple and manufacture of the desired material, wherein the cylindrical portion may be made hollow ODTR solid. Because of the simple coupling, which requires few components, and the free choice of materials, the method according to the invention is particularly suitable for aerospace engineering.

7.2135

According to one embodiment of the invention, the cylindrical area can widen at least at one end to the hollow connecting part via an approximately conical upper passage part.
5

The widening cross-sectional shape favors the constructive and production engineering training in the force application area in terms of mechanical (static, dynamic) strength or sufficient flexural rigidity to avoid shaft vibrations.

In addition, the extension creates space that allows access to the interior of the connecting part for assembly purposes. To this end, the increased corresponding to ¹⁵ transition part through holes may apply provided.

A fiber-reinforced, preferably carbon fiber-reinforced, is particularly suitable for producing the shaft Plastic. The wave can be advantageously in wrap in one piece, with additional if necessary to the fibers fabric strips in the end areas of the Wave can be applied as additional reinforcement. In this case, the annular cross-section of the connecting part both inside and outside ° the same polygonal shape.

To ensure protection against external mechanical stress, it is also provided that the Outside and possibly the inside of the shaft

30th

is thinly surrounded by a glass or aramid fiber layer. It is advantageous here if the protective fiber layer for the inside of the corrugation before winding the load-bearing one Pipe and the outer layers are applied after pipe winding. This creates a controlled compaction of the tubular laminate achieved.

7.2135
07/23/1982

According to an embodiment which is very simple in terms of production technology, there is a in the cavity of the connecting part Connection flange glued in. For shafts made of fiber-reinforced The connecting flange can be wound with material and thus be connected directly to the shaft.

Due to the shaft geometry in connection with a shaft and a connection flange made of plastic is one Shaft created in which with the minimum possible mass one with regard to the power to be transmitted and / or the torsional stiffness required between points is guaranteed. With the adhesive connection between the connecting flange and the hollow shaft, forces at a limited height in the direction of the shaft axis

will wear. The connection flange can be made of metal be.

Embodiments according to the invention are shown schematically in the drawing.

Fig.! "Shows a drive shaft 10, consisting of a central cylindrical area 11, the ends of which merge into a hollow-elliptical connecting part 13 via a conical upper passage part 12. The cross section

of the connecting part can not be circularly symmetrical Take on a shape such as a square, rectangle, Polygon. In Fig. 2 a connecting part 13 'is shown, which has an octagonal cross-section on the inside and is directly

adjoins de, i cylindrical area 11 '. 30th

The shaft 10 is made of fiber composite material. The hollow shaft 10 is in one piece on a collapsible mandrel, not shown, wound, wherein at the end areas 12 and 13 for reinforcement

Fiber mat or fabric can be inserted. as Fibers are carbon, aramid and glass fibers.

7.2135
07/23/1982

In fiber-reinforced shafts 10 of the connecting flange 14 can be wrapped in a winding process directly on the outer circumference _s so that no separate bonding is necessary.

In applications such as in aircraft, the Connection flange 14 made of plastic. in order to give the drive shaft 10 the lowest possible mass. The connection flange 14 can as required be designed accordingly, wherein at both ends of the shaft 10 different shapes are used can. Depending on the area of application, the drive shaft can also only be equipped with a hollow connecting part 13 be. Long holes 16 in the tapered transition area 12 allow the introduction of tools for

Assembly of the shaft on a drive device. 25th

7.2135
07/23/1982

-7-

After winding the shaft 10 and removing the winding mandrel, a connecting flange 14 made of metal or Plastic in the cavity 15 of the elliptical part 13

glued in. The elliptical or polygonal cross-sectional ■

shape of the connecting parts 13 or 13 'allows the entry]

Bringing end fittings for any shaft disp

bindings such as cardan joints or wedge counters for |

Guarantee of axial length compensation. I.

Claims (1)

Dill U * * ^β * -1- gü / sd M.A.N. MASCHINENFABRIK AUGSBURG-NÜRNBERG Aktiengesellschaft Munich, July 23, 1982 Expectations 1. Torsion shaft consisting of at least one partially hollow body, with a cylindrical area, characterized in that attached to at least one end of the cylindrical Area (11) is followed by a hollow connecting part (13) in which at least the inner cross-section is polygonal or approximately oval. 2. Shaft according to claim 1, characterized in that the cylindrical region (11) at least one end extends over an approximately conical transition part (12) onto the connecting part (13) expanded. 3. Shaft according to claim 1 or 2, characterized in that the shaft (10) made of fiber composite material consists. 4. Shaft according to claim 3, characterized in that the cylindrical region (11) together with the end parts (12 or 13) from several consists of fiber layers wound in one operation. 7.2135 20th 25th 30th 35 -Z- 5. Shaft according to one of the preceding claims, characterized in that the shaft (10) on the outside and possibly on the inside is surrounded with a glass fiber or aramid fiber layer. 6. Shaft according to claim 3, characterized in that the end region (12, 13) of the shaft (10) Has fiber mats or fabric between the wound fiber layers. 7. Shaft according to one of the preceding claims, characterized in that in the cavity of the Connecting part (13) a connecting flange (14) is glued in or wrapped. 7.2135
07/23/1982