DE647639C - Friction clutch - Google Patents

Description

In the main patent 634 637 a friction clutch is described in which a part to be bulged out by fluid pressure and causing the frictional engagement is provided, namely the bulging part consists of the peripheral wall of a hollow body shrunk onto the shaft. To shrink the hollow body must the same at the shrinkage points have a certain minimum cross-section to the to achieve the required shrinkage compression without the shrinkage stresses exceeding the permissible Exceed the load limit of the material; dip wall of the hollow body, as far as it is to bulge, must on the other hand be thin-walled. Since the shrunk-on hollow body is very highly stressed, it must be made of a particularly high quality Material. According to the patent specification 634 637, the hollow body to be shrunk on is carved out of a thick-walled hollow cylinder, which initially has a wall thickness must have, which corresponds to the largest cross section, namely that at the shrinkage point; the part of the hollow body that is called The part to be bulged must be thin-walled, then by working away the excess gen materials. This type of manufacture of the hollow body requires one very high material costs, since a very large part of the pre-workpiece is being machined as waste is omitted. Furthermore, the shape of the hollow body is also constructive Reasons disadvantageous. Parts · minor parts close without a smooth transition and very large cross-section to one another. There is therefore a risk that the for the heat treatment required for the shrinking on or, during the subsequent cooling, stresses at the transition points between large and small cross-sections occur.

The invention eliminates the disadvantages of the known type of coupling in that the The circumferential wall of the hollow body shrunk onto the shaft is formed by a tube is, the ends of which are tightly connected to the shaft by special shrink bodies. In many cases is it. z. B. desirable to facilitate disassembly of the clutch, a To avoid hot shrinking and instead the connection by cold shrinking to reach. According to the invention, the pipe ends are conical in this case; the ring-shaped, with corresponding Shrink bodies drilled with conicity are pressed in the axial direction onto the pipe ends, making the pipe ends firm and

Claims (1)

be tightly connected to the associated coupling part. In the Fig. Ι to 3 are different embodiments of friction * -'- clutches shown according to the invention, ■ namely show: ^ Fig. Ι a coupling in which the hollow body is a tube with the same throughout Wall thickness is provided, Fig. 2 the formation of the hollow body with conical ends, Fig. 3 the conical design "of the pipe ends on an enlarged scale. In Fig. Ι α is the wave that has a recess c of shallow depth between the two collars b ^l and b ' ^2. A tube d is pushed over the collars , the part of which lies between collars b ¹ and b '' and is bulged out by the pressure medium entering through the line / into the cavity c and brings about the frictional engagement with the outer coupling part e. To the extent that they rest on the shaft collars b ^l and b- , annular bodies g ¹ and ^{g 2 are} shrunk onto the pipe ends. The hollow body d expediently consists of a drawn tube. If a pipe is chosen for the construction of the coupling which already has the required dimensions, then there is no need for any machining of the pipe. So there is no waste of material: even if over-turning of the pipe should be necessary, the waste of material and the amount of work will be extremely low. In the embodiment according to Fig. 1, the tube d is at the end that extends over the collar b ^l , carried out with the same wall thickness as in the bulging part and tightly connected to the shaft ^{by means of a warm shrunk ring g 1.} The other end of the pipe above the collar b ² is sharpened conically. The ring g- is cold-shrunk. The screws // are used for cold shrinking, through which the washer i against the shrink ring g ¹ um! this is pressed in the axial direction over the conical end of the tube. As a result of the conicity of the tube and the shrink ring, the tube end closes tightly around the collar / < ^{ä of} the shaft. Fig. 2 shows a somewhat modified embodiment in which the tube is shrunk into the outer part c of the coupling by means of the rings g ¹ and g ¹ . . '"■; · Fig. 3 shows, on an enlarged scale, the conical design of one end of the tube J. The formation of the hollow body to be shrunk on according to the invention results apart from the material savings and the reduction in processing costs a very important advantage in terms of machining technology. According to the invention, the hollow body to be shrunk on consists of several Parts, namely a smooth tube, d. H. a tube of constant wall thickness, and the two shrink bodies separated from the tube. So it is there as the whole Hollow body is composed of several parts, no ('transition from large present on small cross-section within the material. The one construction extremely dangerous accumulations of tension and stress peaks at the transition points between large and small cross-sections are thus avoided in the construction described: there are therefore the stresses in the tubular part such as also be distributed essentially evenly in the shrink bodies. P Λ Ϊ E N T Λ X S P RÜ CHE: ι. Friction clutch, in which the one to be bulged by fluid pressure and the frictional engagement part from the L'mfangswand one on the The shaft consists of a shrunk-on hollow body, according to Patent 634 637, characterized in that dal ') the peripheral wall is formed by a tube, the ends of which are through special shrink bodies are tightly connected to the shaft. '2. Friction clutch according to claim 1, characterized in that the conical pipe ends by means of in axial Direction of pressed-on, correspondingly conically drilled annular body tightly connected to the shaft are. 1 sheet of drawings